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href="/UserGuide/latest-Table/Reference/Status-Codes.html" aria-label="Status Codes"><!---->Status Codes<!----></a></li><li><a class="route-link route-link-active auto-link vp-sidebar-link active" href="/UserGuide/latest-Table/Reference/System-Tables_apache.html" aria-label="System Tables"><!---->System Tables<!----></a></li></ul></section></li><li><section class="vp-sidebar-group"><button class="vp-sidebar-header clickable" type="button"><!----><span class="vp-sidebar-title">FAQ</span><span class="vp-arrow end"></span></button><!----></section></li></ul><!----></aside><!--[--><main id="main-content" class="vp-page"><!--[--><!----><!----><nav class="vp-breadcrumb disable"></nav><div class="vp-page-title"><h1><!---->System Tables</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="Writing Date📅" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="calendar icon" 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xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon" name="timer"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 10 min</span><meta property="timeRequired" content="PT10M"></span><!----><!----></div><hr></div><!----><div class="" vp-content><!----><div id="markdown-content"><h1 id="system-tables" tabindex="-1"><a class="header-anchor" href="#system-tables"><span>System Tables</span></a></h1><p>IoTDB has a built-in system database called <code>INFORMATION_SCHEMA</code>, which contains a series of system tables for storing IoTDB runtime information (such as currently executing SQL statements, etc.). Currently, the <code>INFORMATION_SCHEMA</code> database only supports read operations.</p><h2 id="_1-system-database" tabindex="-1"><a class="header-anchor" href="#_1-system-database"><span>1. System Database</span></a></h2><ul><li>​<strong>Name</strong>​: <code>INFORMATION_SCHEMA</code></li><li>​<strong>Commands</strong>​: Read-only, only supports <code>Show databases (DETAILS)</code> / <code>Show Tables (DETAILS)</code> / <code>Use</code>. Other operations will result in an error: <code>&quot;The database &#39;information_schema&#39; can only be queried.&quot;</code></li><li>​<strong>Attributes</strong>​:<code> TTL=INF</code>, other attributes default to <code>null </code></li><li>​<strong>SQL Example</strong>​:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> show databases</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+-------+-----------------------+---------------------+---------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">Database</span><span style="color:#ABB2BF;">|TTL(ms)|SchemaReplicationFactor|DataReplicationFactor|TimePartitionInterval|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+-------+-----------------------+---------------------+---------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| INF| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+-------+-----------------------+---------------------+---------------------+</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#ABB2BF;"> show tables </span><span style="color:#C678DD;">from</span><span style="color:#ABB2BF;"> information_schema</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| TableName|TTL(ms)|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| columns| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| config_nodes| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| configurations| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| connections| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| current_queries| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| data_nodes| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| databases| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| functions| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| keywords| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| nodes| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| pipe_plugins| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| pipes| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| queries| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">|queries_costs_histogram| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| regions| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| services| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| subscriptions| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| tables| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| topics| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">| views| INF|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="_2-system-tables" tabindex="-1"><a class="header-anchor" href="#_2-system-tables"><span>2. System Tables</span></a></h2><ul><li>​<strong>Names</strong>​: <code>DATABASES</code>, <code>TABLES</code>, <code>REGIONS</code>, <code>QUERIES</code>, <code>COLUMNS</code>, <code>PIPES</code>, <code>PIPE_PLUGINS</code>, <code>SUBSCRIPTION</code>, <code>TOPICS</code>, <code>VIEWS</code>, <code>MODELS</code>, <code>FUNCTIONS</code>, <code>CONFIGURATIONS</code>, <code>KEYWORDS</code>, <code>NODES</code>, <code>CONFIG_NODES</code>, <code>DATA_NODES</code> , <code>CONNECTIONS</code>, <code>CURRENT_QUERIES</code>, <code>QUERIES_COSTS_HISTOGRAM</code>, <code>SERVICES</code> (detailed descriptions in later sections)</li><li>​<strong>Operations</strong>​: Read-only, only supports <code>SELECT</code>, <code>COUNT/SHOW DEVICES</code>, <code>DESC</code>. Any modifications to table structure or content are not allowed and will result in an error: <code>&quot;The database &#39;information_schema&#39; can only be queried.&quot; </code></li><li>​<strong>Column Names</strong>​: System table column names are all lowercase by default and separated by underscores (<code>_</code>).</li></ul><h3 id="_2-1-databases" tabindex="-1"><a class="header-anchor" href="#_2-1-databases"><span>2.1 DATABASES</span></a></h3><ul><li>Contains information about all databases in the cluster.</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>database</code></td><td>STRING</td><td>TAG</td><td>Database name</td></tr><tr><td><code>ttl(ms)</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Data retention time</td></tr><tr><td><code>schema_replication_factor</code></td><td>INT32</td><td>ATTRIBUTE</td><td>Schema replica count</td></tr><tr><td><code>data_replication_factor</code></td><td>INT32</td><td>ATTRIBUTE</td><td>Data replica count</td></tr><tr><td><code>time_partition_interval</code></td><td>INT64</td><td>ATTRIBUTE</td><td>Time partition interval</td></tr><tr><td><code>schema_region_group_num</code></td><td>INT32</td><td>ATTRIBUTE</td><td>Number of schema region groups</td></tr><tr><td><code>data_region_group_num</code></td><td>INT32</td><td>ATTRIBUTE</td><td>Number of data region groups</td></tr></tbody></table><ul><li>The query results only display the collection of databases for which you have any permission on the database itself or any table within the database.</li><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">databases</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+-------+-------------------------+-----------------------+-----------------------+-----------------------+---------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">database</span><span style="color:#ABB2BF;">|ttl(ms)|schema_replication_factor|data_replication_factor|time_partition_interval|schema_region_group_num|data_region_group_num|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+-------+-------------------------+-----------------------+-----------------------+-----------------------+---------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| INF| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| database1| INF| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">604800000</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+-------+-------------------------+-----------------------+-----------------------+-----------------------+---------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-2-tables" tabindex="-1"><a class="header-anchor" href="#_2-2-tables"><span>2.2 TABLES</span></a></h3><ul><li>Contains information about all tables in the cluster.</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>database</code></td><td>STRING</td><td>TAG</td><td>Database name</td></tr><tr><td><code>table_name</code></td><td>STRING</td><td>TAG</td><td>Table name</td></tr><tr><td><code>ttl(ms)</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Data retention time</td></tr><tr><td><code>status</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Status</td></tr><tr><td><code>comment</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Description/comment</td></tr></tbody></table><ul><li>Note: Possible values for <code>status</code>: <code>USING</code>, <code>PRE_CREATE</code>, <code>PRE_DELETE</code>. For details, refer to the <a class="route-link" href="/UserGuide/latest-Table/Basic-Concept/Table-Management_apache.html#_12-view-tables">View Tables</a> in Table Management documentation</li><li>The query results only display the collection of tables for which you have any permission.</li><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">tables</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+--------------+-----------+------+-------+-----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">database</span><span style="color:#ABB2BF;">| table_name| ttl(ms)|</span><span style="color:#C678DD;">status</span><span style="color:#ABB2BF;">|comment| table_type|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+--------------+-----------+------+-------+-----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| databases| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| models| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| subscriptions| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| regions| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| functions| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| keywords| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| columns| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| topics| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema|configurations| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| queries| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| tables| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| pipe_plugins| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| nodes| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| data_nodes| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| pipes| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| views| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">|information_schema| config_nodes| INF| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">SYSTEM</span><span style="color:#ABB2BF;"> VIEW|</span></span>
<span class="line"><span style="color:#ABB2BF;">| database1| table1|</span><span style="color:#D19A66;">31536000000</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| BASE </span><span style="color:#C678DD;">TABLE</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------------+--------------+-----------+------+-------+-----------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-3-regions" tabindex="-1"><a class="header-anchor" href="#_2-3-regions"><span>2.3 REGIONS</span></a></h3><ul><li>Contains information about all regions in the cluster.</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>region_id</code></td><td>INT32</td><td>TAG</td><td>Region ID</td></tr><tr><td><code>datanode_id</code></td><td>INT32</td><td>TAG</td><td>DataNode ID</td></tr><tr><td><code>type</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Type (<code>SchemaRegion</code>/<code>DataRegion</code>)</td></tr><tr><td><code>status</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Status (<code>Running</code>,<code>Unknown</code>, etc.)</td></tr><tr><td><code>database</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Database name</td></tr><tr><td><code>series_slot_num</code></td><td>INT32</td><td>ATTRIBUTE</td><td>Number of series slots</td></tr><tr><td><code>time_slot_num</code></td><td>INT64</td><td>ATTRIBUTE</td><td>Number of time slots</td></tr><tr><td><code>rpc_address</code></td><td>STRING</td><td>ATTRIBUTE</td><td>RPC address</td></tr><tr><td><code>rpc_port</code></td><td>INT32</td><td>ATTRIBUTE</td><td>RPC port</td></tr><tr><td><code>internal_address</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Internal communication address</td></tr><tr><td><code>role</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Role (<code>Leader</code>/<code>Follower</code>)</td></tr><tr><td><code>create_time</code></td><td>TIMESTAMP</td><td>ATTRIBUTE</td><td>Creation time</td></tr><tr><td><code>tsfile_size_bytes</code></td><td>INT64</td><td>ATTRIBUTE</td><td>- For​<strong>DataRegion with statistics ​</strong>​: Total file size of TsFiles. <br>- For<strong>DataRegion without statistics</strong>(Unknown):<code>-1</code>.<br>- For​<strong>SchemaRegion</strong>​:<code>null</code>.</td></tr></tbody></table><ul><li>Only administrators are allowed to perform query operations.</li><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">regions</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+-----------+------------+-------+---------+---------------+-------------+-----------+--------+----------------+------+-----------------------------+-----------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|region_id|datanode_id| </span><span style="color:#C678DD;">type</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">status</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">database</span><span style="color:#ABB2BF;">|series_slot_num|time_slot_num|rpc_address|rpc_port|internal_address| </span><span style="color:#C678DD;">role</span><span style="color:#ABB2BF;">| create_time|tsfile_size_bytes|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+-----------+------------+-------+---------+---------------+-------------+-----------+--------+----------------+------+-----------------------------+-----------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|SchemaRegion|Running|database1| </span><span style="color:#D19A66;">12</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|Leader|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">03</span><span style="color:#ABB2BF;">-31T11:</span><span style="color:#D19A66;">19</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">485</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| DataRegion|Running|database1| </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|Leader|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">03</span><span style="color:#ABB2BF;">-31T11:</span><span style="color:#D19A66;">19</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">09</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">156</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">3985</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| DataRegion|Running|database1| </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|Leader|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">03</span><span style="color:#ABB2BF;">-31T11:</span><span style="color:#D19A66;">19</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">09</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">156</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">3841</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+-----------+------------+-------+---------+---------------+-------------+-----------+--------+----------------+------+-----------------------------+-----------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-4-queries" tabindex="-1"><a class="header-anchor" href="#_2-4-queries"><span>2.4 QUERIES</span></a></h3><ul><li>Contains information about all currently executing queries in the cluster. Can also be queried using the <code>SHOW QUERIES</code> syntax.</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>query_id</code></td><td>STRING</td><td>TAG</td><td>Query ID</td></tr><tr><td><code>start_time</code></td><td>TIMESTAMP</td><td>ATTRIBUTE</td><td>Query start timestamp (precision matches system precision)</td></tr><tr><td><code>datanode_id</code></td><td>INT32</td><td>ATTRIBUTE</td><td>DataNode ID that initiated the query</td></tr><tr><td><code>elapsed_time</code></td><td>FLOAT</td><td>ATTRIBUTE</td><td>Query execution duration (in seconds)</td></tr><tr><td><code>statement</code></td><td>STRING</td><td>ATTRIBUTE</td><td>SQL statement of the query</td></tr><tr><td><code>user</code></td><td>STRING</td><td>ATTRIBUTE</td><td>User who initiated the query</td></tr></tbody></table><ul><li>For regular users, the query results only display the queries executed by themselves; for administrators, all queries are displayed.</li><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">queries</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-----------------------------+-----------+------------+----------------------------------------+----+</span></span>
<span class="line"><span style="color:#ABB2BF;">| query_id| start_time|datanode_id|elapsed_time| </span><span style="color:#C678DD;">statement</span><span style="color:#ABB2BF;">|user|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-----------------------------+-----------+------------+----------------------------------------+----+</span></span>
<span class="line"><span style="color:#ABB2BF;">|20250331_023242_00011_1|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">03</span><span style="color:#ABB2BF;">-31T10:</span><span style="color:#D19A66;">32</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">42</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">360</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">025</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">queries</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">root</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-----------------------------+-----------+------------+----------------------------------------+----+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-5-columns" tabindex="-1"><a class="header-anchor" href="#_2-5-columns"><span>2.5 COLUMNS</span></a></h3><ul><li>Contains information about all columns in tables across the cluster</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>database</code></td><td>STRING</td><td>TAG</td><td>Database name</td></tr><tr><td><code>table_name</code></td><td>STRING</td><td>TAG</td><td>Table name</td></tr><tr><td><code>column_name</code></td><td>STRING</td><td>TAG</td><td>Column name</td></tr><tr><td><code>datatype</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Column data type</td></tr><tr><td><code>category</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Column category</td></tr><tr><td><code>status</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Column status</td></tr><tr><td><code>comment</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Column description</td></tr></tbody></table><p>Notes:</p><ul><li><p>Possible values for <code>status</code>: <code>USING</code>, <code>PRE_DELETE</code>. For details, refer to <a class="route-link" href="/UserGuide/latest-Table/Basic-Concept/Table-Management_apache.html#_13-view-table-columns">Viewing Table Columns</a> in Table Management documentation.</p></li><li><p>The query results only display the column information of tables for which you have any permission.</p></li><li><p>Query Example:</p></li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">columns</span><span style="color:#C678DD;"> where</span><span style="color:#C678DD;"> database</span><span style="color:#56B6C2;"> =</span><span style="color:#98C379;"> &#39;database1&#39;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+----------+------------+---------+---------+------+-------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">database</span><span style="color:#ABB2BF;">|table_name| column_name| datatype| category|</span><span style="color:#C678DD;">status</span><span style="color:#ABB2BF;">|comment|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+----------+------------+---------+---------+------+-------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| </span><span style="color:#C678DD;">time</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">TIMESTAMP</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">TIME</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| region| STRING| TAG| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| plant_id| STRING| TAG| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| device_id| STRING| TAG| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| model_id| STRING|ATTRIBUTE| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| maintenance| STRING|ATTRIBUTE| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| temperature| </span><span style="color:#C678DD;">FLOAT</span><span style="color:#ABB2BF;">| FIELD| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| humidity| </span><span style="color:#C678DD;">FLOAT</span><span style="color:#ABB2BF;">| FIELD| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1| </span><span style="color:#C678DD;">status</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">BOOLEAN</span><span style="color:#ABB2BF;">| FIELD| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| table1|arrival_time|</span><span style="color:#C678DD;">TIMESTAMP</span><span style="color:#ABB2BF;">| FIELD| </span><span style="color:#C678DD;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+----------+------------+---------+---------+------+-------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-6-pipes" tabindex="-1"><a class="header-anchor" href="#_2-6-pipes"><span>2.6 PIPES</span></a></h3><ul><li>Contains information about all pipes in the cluster</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>id</code></td><td>STRING</td><td>TAG</td><td>Pipe name</td></tr><tr><td><code>creation_time</code></td><td>TIMESTAMP</td><td>ATTRIBUTE</td><td>Creation time</td></tr><tr><td><code>state</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Pipe status (<code>RUNNING</code>/<code>STOPPED</code>)</td></tr><tr><td><code>pipe_source</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Source plugin parameters</td></tr><tr><td><code>pipe_processor</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Processor plugin parameters</td></tr><tr><td><code>pipe_sink</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Sink plugin parameters</td></tr><tr><td><code>exception_message</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Exception message</td></tr><tr><td><code>remaining_event_count</code></td><td>INT64</td><td>ATTRIBUTE</td><td>Remaining event count (<code>-1</code>if Unknown)</td></tr><tr><td><code>estimated_remaining_seconds</code></td><td>DOUBLE</td><td>ATTRIBUTE</td><td>Estimated remaining time in seconds (<code>-1</code>if Unknown)</td></tr></tbody></table><ul><li>Only administrators are allowed to perform operations.</li><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipes</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-----------------------------+-------+--------------------------------------------------------------------------+--------------+-----------------------------------------------------------------------+-----------------+---------------------+---------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| id| creation_time| </span><span style="color:#C678DD;">state</span><span style="color:#ABB2BF;">| pipe_source|pipe_processor| pipe_sink|exception_message|remaining_event_count|estimated_remaining_seconds|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-----------------------------+-------+--------------------------------------------------------------------------+--------------+-----------------------------------------------------------------------+-----------------+---------------------+---------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|tablepipe1|</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">03</span><span style="color:#ABB2BF;">-31T12:</span><span style="color:#D19A66;">25</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">24</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">040</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">|RUNNING|{</span><span style="color:#D19A66;">__system</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">sql</span><span style="color:#ABB2BF;">-dialect</span><span style="color:#56B6C2;">=</span><span style="color:#C678DD;">table</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">source</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">password</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">******, </span><span style="color:#D19A66;">source</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">username</span><span style="color:#56B6C2;">=</span><span style="color:#C678DD;">root</span><span style="color:#ABB2BF;">}| {}|{format</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">hybrid, node-urls</span><span style="color:#56B6C2;">=</span><span style="color:#D19A66;">192</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">168</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">xxx</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">xxx</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">, sink</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">iotdb-thrift-sink}| | </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-----------------------------+-------+--------------------------------------------------------------------------+--------------+-----------------------------------------------------------------------+-----------------+---------------------+---------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-7-pipe-plugins" tabindex="-1"><a class="header-anchor" href="#_2-7-pipe-plugins"><span>2.7 PIPE_PLUGINS</span></a></h3><ul><li>Contains information about all PIPE plugins in the cluster</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>plugin_name</code></td><td>STRING</td><td>TAG</td><td>Plugin name</td></tr><tr><td><code>plugin_type</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Plugin type (<code>Builtin</code>/<code>External</code>)</td></tr><tr><td><code>class_name</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Plugin&#39;s main class name</td></tr><tr><td><code>plugin_jar</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Plugin&#39;s JAR file name (<code>null</code>for builtin type)</td></tr></tbody></table><ul><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipe_plugins</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------------+-----------+-------------------------------------------------------------------------------------------------+----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| plugin_name|plugin_type| class_name|plugin_jar|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------------+-----------+-------------------------------------------------------------------------------------------------+----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|IOTDB-THRIFT-</span><span style="color:#C678DD;">SSL</span><span style="color:#ABB2BF;">-SINK| Builtin|</span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipe</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">agent</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">plugin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">builtin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">connector</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">thrift</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">IoTDBThriftSslConnector</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| IOTDB-AIR-GAP-SINK| Builtin| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipe</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">agent</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">plugin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">builtin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">connector</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">airgap</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">IoTDBAirGapConnector</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DO-NOTHING-SINK| Builtin| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipe</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">agent</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">plugin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">builtin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">connector</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">donothing</span><span style="color:#ABB2BF;">.DoNothingConnector| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DO-NOTHING-PROCESSOR| Builtin| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipe</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">agent</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">plugin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">builtin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">processor</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">donothing</span><span style="color:#ABB2BF;">.DoNothingProcessor| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| IOTDB-THRIFT-SINK| Builtin| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipe</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">agent</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">plugin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">builtin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">connector</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">thrift</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">IoTDBThriftConnector</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| IOTDB-SOURCE| Builtin| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">pipe</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">agent</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">plugin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">builtin</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">extractor</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.IoTDBExtractor| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------------+-----------+-------------------------------------------------------------------------------------------------+----------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-8-subscriptions" tabindex="-1"><a class="header-anchor" href="#_2-8-subscriptions"><span>2.8 SUBSCRIPTIONS</span></a></h3><ul><li>Contains information about all data subscriptions in the cluster</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>topic_name</code></td><td>STRING</td><td>TAG</td><td>Subscription topic name</td></tr><tr><td><code>consumer_group_name</code></td><td>STRING</td><td>TAG</td><td>Consumer group name</td></tr><tr><td><code>subscribed_consumers</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Subscribed consumers</td></tr></tbody></table><ul><li>Only administrators are allowed to perform operations.</li><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">subscriptions</span><span style="color:#C678DD;"> where</span><span style="color:#ABB2BF;"> topic_name </span><span style="color:#56B6C2;">=</span><span style="color:#98C379;"> &#39;topic_1&#39;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-------------------+--------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|topic_name|consumer_group_name| subscribed_consumers|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-------------------+--------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| topic_1| cg1|</span><span style="color:#E06C75;">[c3, c4, c5, c6, c7, c0, c1, c2]</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+-------------------+--------------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-9-topics" tabindex="-1"><a class="header-anchor" href="#_2-9-topics"><span>2.9 TOPICS</span></a></h3><ul><li>Contains information about all data subscription topics in the cluster</li><li>Table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td><code>topic_name</code></td><td>STRING</td><td>TAG</td><td>Subscription topic name</td></tr><tr><td><code>topic_configs</code></td><td>STRING</td><td>ATTRIBUTE</td><td>Topic configuration parameters</td></tr></tbody></table><ul><li>Only administrators are allowed to perform operations.</li><li>Query Example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">topics</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|topic_name| topic_configs|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| topic|{</span><span style="color:#D19A66;">__system</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">sql</span><span style="color:#ABB2BF;">-dialect</span><span style="color:#56B6C2;">=</span><span style="color:#C678DD;">table</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">start</span><span style="color:#ABB2BF;">-</span><span style="color:#C678DD;">time</span><span style="color:#56B6C2;">=</span><span style="color:#D19A66;">2025</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">01</span><span style="color:#ABB2BF;">-10T17:</span><span style="color:#D19A66;">05</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">38</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">282</span><span style="color:#ABB2BF;">}|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+----------------------------------------------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-10-views" tabindex="-1"><a class="header-anchor" href="#_2-10-views"><span>2.10 VIEWS</span></a></h3><blockquote><p>This system table is available starting from version V2.0.5.</p></blockquote><ul><li>Contains information about all table views in the database.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>database</td><td>STRING</td><td>TAG</td><td>Database name</td></tr><tr><td>table_name</td><td>STRING</td><td>TAG</td><td>View name</td></tr><tr><td>view_definition</td><td>STRING</td><td>ATTRIBUTE</td><td>SQL statement for view creation</td></tr></tbody></table><ul><li>The query results only display the collection of views for which you have any permission.</li><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">views</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+----------+---------------------------------------------------------------------------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">database</span><span style="color:#ABB2BF;">|table_name| view_definition|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+----------+---------------------------------------------------------------------------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|database1| ln|</span><span style="color:#C678DD;">CREATE</span><span style="color:#ABB2BF;"> VIEW </span><span style="color:#98C379;">&quot;ln&quot;</span><span style="color:#ABB2BF;"> (</span><span style="color:#98C379;">&quot;device&quot;</span><span style="color:#ABB2BF;"> STRING TAG,</span><span style="color:#98C379;">&quot;model&quot;</span><span style="color:#ABB2BF;"> STRING TAG,</span><span style="color:#98C379;">&quot;status&quot;</span><span style="color:#C678DD;"> BOOLEAN</span><span style="color:#ABB2BF;"> FIELD,</span><span style="color:#98C379;">&quot;hardware&quot;</span><span style="color:#ABB2BF;"> STRING FIELD) </span><span style="color:#C678DD;">WITH</span><span style="color:#ABB2BF;"> (ttl</span><span style="color:#56B6C2;">=</span><span style="color:#98C379;">&#39;INF&#39;</span><span style="color:#ABB2BF;">) </span><span style="color:#C678DD;">AS</span><span style="color:#D19A66;"> root</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">ln</span><span style="color:#ABB2BF;">.**|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------+----------+---------------------------------------------------------------------------------------------------------------------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-11-models" tabindex="-1"><a class="header-anchor" href="#_2-11-models"><span>2.11 MODELS</span></a></h3><blockquote><p>This system table is available starting from version V 2.0.5 and has been discontinued since version V 2.0.8.</p></blockquote><ul><li>Contains information about all models in the database.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>model_id</td><td>STRING</td><td>TAG</td><td>Model name</td></tr><tr><td>model_type</td><td>STRING</td><td>ATTRIBUTE</td><td>Model type (Forecast, Anomaly Detection, Custom)</td></tr><tr><td>state</td><td>STRING</td><td>ATTRIBUTE</td><td>Model status (Available/Unavailable)</td></tr><tr><td>configs</td><td>STRING</td><td>ATTRIBUTE</td><td>String format of model hyperparameters, consistent with the output of the <code>show</code> command</td></tr><tr><td>notes</td><td>STRING</td><td>ATTRIBUTE</td><td>Model description* Built-in model: Built-in model in IoTDB* User-defined model: Custom model</td></tr></tbody></table><ul><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#7F848E;font-style:italic;">-- Find all built-in forecast models</span></span>
<span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">models</span><span style="color:#C678DD;"> where</span><span style="color:#ABB2BF;"> model_type </span><span style="color:#56B6C2;">=</span><span style="color:#98C379;"> &#39;BUILT_IN_FORECAST&#39;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------------+-----------------+------+-------+-----------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| model_id| model_type| </span><span style="color:#C678DD;">state</span><span style="color:#ABB2BF;">|configs| notes|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------------+-----------------+------+-------+-----------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| _STLForecaster|BUILT_IN_FORECAST|ACTIVE| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|Built-</span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> model </span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> IoTDB|</span></span>
<span class="line"><span style="color:#ABB2BF;">| _NaiveForecaster|BUILT_IN_FORECAST|ACTIVE| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|Built-</span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> model </span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> IoTDB|</span></span>
<span class="line"><span style="color:#ABB2BF;">| _ARIMA|BUILT_IN_FORECAST|ACTIVE| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|Built-</span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> model </span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> IoTDB|</span></span>
<span class="line"><span style="color:#ABB2BF;">|_ExponentialSmoothing|BUILT_IN_FORECAST|ACTIVE| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|Built-</span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> model </span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> IoTDB|</span></span>
<span class="line"><span style="color:#ABB2BF;">| _HoltWinters|BUILT_IN_FORECAST|ACTIVE| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|Built-</span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> model </span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> IoTDB|</span></span>
<span class="line"><span style="color:#ABB2BF;">| _sundial|BUILT_IN_FORECAST|ACTIVE| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|Built-</span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> model </span><span style="color:#C678DD;">in</span><span style="color:#ABB2BF;"> IoTDB|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">---------------------+-----------------+------+-------+-----------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-12-functions" tabindex="-1"><a class="header-anchor" href="#_2-12-functions"><span>2.12 FUNCTIONS</span></a></h3><blockquote><p>This system table is available starting from version V2.0.5.</p></blockquote><ul><li>Contains information about all functions in the database.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>function_name</td><td>STRING</td><td>TAG</td><td>Function name</td></tr><tr><td>function_type</td><td>STRING</td><td>ATTRIBUTE</td><td>Function type (Built-in/User-defined, Scalar/Aggregation/Table Function)</td></tr><tr><td>class_name(udf)</td><td>STRING</td><td>ATTRIBUTE</td><td>Class name if it is a UDF, otherwise null (tentative)</td></tr><tr><td>state</td><td>STRING</td><td>ATTRIBUTE</td><td>Availability status</td></tr></tbody></table><ul><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">functions</span><span style="color:#C678DD;"> where</span><span style="color:#ABB2BF;"> function_type</span><span style="color:#56B6C2;">=</span><span style="color:#98C379;">&#39;built-in table function&#39;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">--------------+-----------------------+---------------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|function_name | function_type|class_name(udf)| </span><span style="color:#C678DD;">state</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">--------------+-----------------------+---------------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| CUMULATE|built-</span><span style="color:#C678DD;">in</span><span style="color:#C678DD;"> table</span><span style="color:#C678DD;"> function</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|AVAILABLE|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">SESSION</span><span style="color:#ABB2BF;">|built-</span><span style="color:#C678DD;">in</span><span style="color:#C678DD;"> table</span><span style="color:#C678DD;"> function</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|AVAILABLE|</span></span>
<span class="line"><span style="color:#ABB2BF;">| HOP|built-</span><span style="color:#C678DD;">in</span><span style="color:#C678DD;"> table</span><span style="color:#C678DD;"> function</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|AVAILABLE|</span></span>
<span class="line"><span style="color:#ABB2BF;">| TUMBLE|built-</span><span style="color:#C678DD;">in</span><span style="color:#C678DD;"> table</span><span style="color:#C678DD;"> function</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|AVAILABLE|</span></span>
<span class="line"><span style="color:#ABB2BF;">| FORECAST|built-</span><span style="color:#C678DD;">in</span><span style="color:#C678DD;"> table</span><span style="color:#C678DD;"> function</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|AVAILABLE|</span></span>
<span class="line"><span style="color:#ABB2BF;">| VARIATION|built-</span><span style="color:#C678DD;">in</span><span style="color:#C678DD;"> table</span><span style="color:#C678DD;"> function</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|AVAILABLE|</span></span>
<span class="line"><span style="color:#ABB2BF;">| CAPACITY|built-</span><span style="color:#C678DD;">in</span><span style="color:#C678DD;"> table</span><span style="color:#C678DD;"> function</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">|AVAILABLE|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">--------------+-----------------------+---------------+---------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-13-configurations" tabindex="-1"><a class="header-anchor" href="#_2-13-configurations"><span>2.13 CONFIGURATIONS</span></a></h3><blockquote><p>This system table is available starting from version V2.0.5.</p></blockquote><ul><li>Contains all configuration properties of the database.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>variable</td><td>STRING</td><td>TAG</td><td>Configuration property name</td></tr><tr><td>value</td><td>STRING</td><td>ATTRIBUTE</td><td>Configuration property value</td></tr></tbody></table><ul><li>Only administrators are allowed to perform operations on this table.</li><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">configurations</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------------------------------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| variable| </span><span style="color:#C678DD;">value</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------------------------------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| ClusterName| defaultCluster|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DataReplicationFactor| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SchemaReplicationFactor| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DataRegionConsensusProtocolClass| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">consensus</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iot</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">IoTConsensus</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|SchemaRegionConsensusProtocolClass| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">consensus</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">ratis</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">RatisConsensus</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| ConfigNodeConsensusProtocolClass| </span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">consensus</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">ratis</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">RatisConsensus</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| TimePartitionOrigin| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| TimePartitionInterval| </span><span style="color:#D19A66;">604800000</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| ReadConsistencyLevel| strong|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SchemaRegionPerDataNode| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DataRegionPerDataNode| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SeriesSlotNum| </span><span style="color:#D19A66;">1000</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| SeriesSlotExecutorClass|</span><span style="color:#D19A66;">org</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">apache</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">iotdb</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">commons</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">partition</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">executor</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">hash</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">BKDRHashExecutor</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| DiskSpaceWarningThreshold| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">05</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| TimestampPrecision| ms|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------------------------------+-----------------------------------------------------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-14-keywords" tabindex="-1"><a class="header-anchor" href="#_2-14-keywords"><span>2.14 KEYWORDS</span></a></h3><blockquote><p>This system table is available starting from version V2.0.5.</p></blockquote><ul><li>Contains all keywords in the database.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>word</td><td>STRING</td><td>TAG</td><td>Keyword</td></tr><tr><td>reserved</td><td>INT32</td><td>ATTRIBUTE</td><td>Whether it is a reserved word (1 = Yes, 0 = No)</td></tr></tbody></table><ul><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">keywords</span><span style="color:#C678DD;"> limit</span><span style="color:#D19A66;"> 10</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+--------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| word|reserved|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+--------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">ABSENT</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">ACTIVATION</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| ACTIVATE| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">ADD</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">ADMIN</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">AFTER</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| AINODES| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| ALL| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">ALTER</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| ANALYZE| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">----------+--------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-15-nodes" tabindex="-1"><a class="header-anchor" href="#_2-15-nodes"><span>2.15 NODES</span></a></h3><blockquote><p>This system table is available starting from version V2.0.5.</p></blockquote><ul><li>Contains information about all nodes in the database cluster.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>node_id</td><td>INT32</td><td>TAG</td><td>Node ID</td></tr><tr><td>node_type</td><td>STRING</td><td>ATTRIBUTE</td><td>Node type</td></tr><tr><td>status</td><td>STRING</td><td>ATTRIBUTE</td><td>Node status</td></tr><tr><td>internal_address</td><td>STRING</td><td>ATTRIBUTE</td><td>Internal RPC address</td></tr><tr><td>internal_port</td><td>INT32</td><td>ATTRIBUTE</td><td>Internal port</td></tr><tr><td>version</td><td>STRING</td><td>ATTRIBUTE</td><td>Version number</td></tr><tr><td>build_info</td><td>STRING</td><td>ATTRIBUTE</td><td>Commit ID</td></tr><tr><td>activate_status (Enterprise Edition only)</td><td>STRING</td><td>ATTRIBUTE</td><td>Activation status</td></tr></tbody></table><ul><li>Only administrators are allowed to perform operations on this table.</li><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">nodes</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+----------+-------+----------------+-------------+-------+----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|node_id| node_type| </span><span style="color:#C678DD;">status</span><span style="color:#ABB2BF;">|internal_address|internal_port|</span><span style="color:#C678DD;">version</span><span style="color:#ABB2BF;">|build_info|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+----------+-------+----------------+-------------+-------+----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|ConfigNode|Running| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">10710</span><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| 58d685e|</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| DataNode|Running| </span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">10730</span><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| 58d685e|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+----------+-------+----------------+-------------+-------+----------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-16-config-nodes" tabindex="-1"><a class="header-anchor" href="#_2-16-config-nodes"><span>2.16 CONFIG_NODES</span></a></h3><blockquote><p>This system table is available starting from version V2.0.5.</p></blockquote><ul><li>Contains information about all ConfigNodes in the cluster.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>node_id</td><td>INT32</td><td>TAG</td><td>Node ID</td></tr><tr><td>config_consensus_port</td><td>INT32</td><td>ATTRIBUTE</td><td>ConfigNode consensus port</td></tr><tr><td>role</td><td>STRING</td><td>ATTRIBUTE</td><td>ConfigNode role</td></tr></tbody></table><ul><li>Only administrators are allowed to perform operations on this table.</li><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">config_nodes</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------------------+------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|node_id|config_consensus_port| </span><span style="color:#C678DD;">role</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------------------+------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">10720</span><span style="color:#ABB2BF;">|Leader|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------------------+------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-17-data-nodes" tabindex="-1"><a class="header-anchor" href="#_2-17-data-nodes"><span>2.17 DATA_NODES</span></a></h3><blockquote><p>This system table is available starting from version V2.0.5.</p></blockquote><ul><li>Contains information about all DataNodes in the cluster.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Category</th><th>Description</th></tr></thead><tbody><tr><td>node_id</td><td>INT32</td><td>TAG</td><td>Node ID</td></tr><tr><td>data_region_num</td><td>INT32</td><td>ATTRIBUTE</td><td>Number of DataRegions</td></tr><tr><td>schema_region_num</td><td>INT32</td><td>ATTRIBUTE</td><td>Number of SchemaRegions</td></tr><tr><td>rpc_address</td><td>STRING</td><td>ATTRIBUTE</td><td>RPC address</td></tr><tr><td>rpc_port</td><td>INT32</td><td>ATTRIBUTE</td><td>RPC port</td></tr><tr><td>mpp_port</td><td>INT32</td><td>ATTRIBUTE</td><td>MPP communication port</td></tr><tr><td>data_consensus_port</td><td>INT32</td><td>ATTRIBUTE</td><td>DataRegion consensus port</td></tr><tr><td>schema_consensus_port</td><td>INT32</td><td>ATTRIBUTE</td><td>SchemaRegion consensus port</td></tr></tbody></table><ul><li>Only administrators are allowed to perform operations on this table.</li><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">data_nodes</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------------+-----------------+-----------+--------+--------+-------------------+---------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|node_id|data_region_num|schema_region_num|rpc_address|rpc_port|mpp_port|data_consensus_port|schema_consensus_port|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------------+-----------------+-----------+--------+--------+-------------------+---------------------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">4</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">4</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">6667</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">10740</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">10760</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">10750</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-------+---------------+-----------------+-----------+--------+--------+-------------------+---------------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-18-connections" tabindex="-1"><a class="header-anchor" href="#_2-18-connections"><span>2.18 CONNECTIONS</span></a></h3><blockquote><p>This system table is available starting from version V 2.0.8</p></blockquote><ul><li>Contains all connections in the cluster.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th><strong>Column Name</strong></th><th><strong>Data Type</strong></th><th><strong>Column Type</strong></th><th><strong>Description</strong></th></tr></thead><tbody><tr><td>datanode_id</td><td>STRING</td><td>TAG</td><td>DataNode ID</td></tr><tr><td>user_id</td><td>STRING</td><td>TAG</td><td>User ID</td></tr><tr><td>session_id</td><td>STRING</td><td>TAG</td><td>Session ID</td></tr><tr><td>user_name</td><td>STRING</td><td>ATTRIBUTE</td><td>Username</td></tr><tr><td>last_active_time</td><td>TIMESTAMP</td><td>ATTRIBUTE</td><td>Last active time</td></tr><tr><td>client_ip</td><td>STRING</td><td>ATTRIBUTE</td><td>Client IP address</td></tr></tbody></table><ul><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">connections</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------+-------+----------+---------+-----------------------------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|datanode_id|user_id|session_id|user_name| last_active_time|client_ip|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------+-------+----------+---------+-----------------------------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">root</span><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">2026</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">01</span><span style="color:#ABB2BF;">-21T16:</span><span style="color:#D19A66;">28</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">54</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">704</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------+-------+----------+---------+-----------------------------+---------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-19-current-queries" tabindex="-1"><a class="header-anchor" href="#_2-19-current-queries"><span>2.19 CURRENT_QUERIES</span></a></h3><blockquote><p>This system table is available starting from version V 2.0.8</p></blockquote><ul><li>Contains all queries whose execution end time falls within the range <code>[now() - query_cost_stat_window, now())</code>, including currently executing queries. The <code>query_cost_stat_window</code> parameter represents the query cost statistics window. Its default value is 0 and can be configured via the <code>iotdb-system.properties</code> configuration file.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td>query_id</td><td>STRING</td><td>TAG</td><td>Query statement ID</td></tr><tr><td>state</td><td>STRING</td><td>FIELD</td><td>Query state: RUNNING indicates executing, FINISHED indicates completed</td></tr><tr><td>start_time</td><td>TIMESTAMP</td><td>FIELD</td><td>Query start timestamp (precision matches system timestamp precision)</td></tr><tr><td>end_time</td><td>TIMESTAMP</td><td>FIELD</td><td>Query end timestamp (precision matches system timestamp precision). NULL if query is not yet finished</td></tr><tr><td>datanode_id</td><td>INT32</td><td>FIELD</td><td>DataNode from which the query was initiated</td></tr><tr><td>cost_time</td><td>FLOAT</td><td>FIELD</td><td>Query execution time in seconds. If query is not finished, shows elapsed time</td></tr><tr><td>statement</td><td>STRING</td><td>FIELD</td><td>Query SQL / concatenated query request SQL</td></tr><tr><td>user</td><td>STRING</td><td>FIELD</td><td>User who initiated the query</td></tr><tr><td>client_ip</td><td>STRING</td><td>FIELD</td><td>Client IP address that initiated the query</td></tr></tbody></table><ul><li>Regular users can only view their own queries; administrators can view all queries.</li><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">current_queries</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-------+-----------------------------+--------+-----------+---------+------------------------------------------------+----+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| query_id| </span><span style="color:#C678DD;">state</span><span style="color:#ABB2BF;">| start_time|end_time|datanode_id|cost_time| </span><span style="color:#C678DD;">statement</span><span style="color:#ABB2BF;">|user|client_ip|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-------+-----------------------------+--------+-----------+---------+------------------------------------------------+----+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|20260121_085427_00013_1|RUNNING|</span><span style="color:#D19A66;">2026</span><span style="color:#ABB2BF;">-</span><span style="color:#D19A66;">01</span><span style="color:#ABB2BF;">-21T16:</span><span style="color:#D19A66;">54</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">27</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">019</span><span style="color:#ABB2BF;">+</span><span style="color:#D19A66;">08</span><span style="color:#ABB2BF;">:</span><span style="color:#D19A66;">00</span><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">null</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">current_queries</span><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">root</span><span style="color:#ABB2BF;">|</span><span style="color:#D19A66;">127</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">-----------------------+-------+-----------------------------+--------+-----------+---------+------------------------------------------------+----+---------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-20-queries-costs-histogram" tabindex="-1"><a class="header-anchor" href="#_2-20-queries-costs-histogram"><span>2.20 QUERIES_COSTS_HISTOGRAM</span></a></h3><blockquote><p>This system table is available starting from version V 2.0.8</p></blockquote><ul><li>Contains a histogram of query execution times within the past <code>query_cost_stat_window</code> period (only statistics for completed SQL queries). The <code>query_cost_stat_window</code> parameter represents the query cost statistics window. Its default value is 0 and can be configured via the <code>iotdb-system.properties</code> configuration file.</li><li>The table structure is as follows:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td>bin</td><td>STRING</td><td>TAG</td><td>Bucket name: 61 buckets total - [0, 1), [1, 2), [2, 3), ..., [59, 60), 60+</td></tr><tr><td>nums</td><td>INT32</td><td>FIELD</td><td>Number of SQL queries in the bucket</td></tr><tr><td>datanode_id</td><td>INT32</td><td>FIELD</td><td>DataNode to which this bucket belongs</td></tr></tbody></table><ul><li>Only administrators can execute operations on this table.</li><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> select</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">from</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">queries_costs_histogram</span><span style="color:#C678DD;"> limit</span><span style="color:#D19A66;"> 10</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------+----+-----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| bin|nums|datanode_id|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------+----+-----------+</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">4</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">4</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">6</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">7</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">7</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">8</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">| [</span><span style="color:#D19A66;">8</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">9</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">|[</span><span style="color:#D19A66;">9</span><span style="color:#ABB2BF;">,</span><span style="color:#D19A66;">10</span><span style="color:#ABB2BF;">)| </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">| </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">|</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------+----+-----------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-21-services" tabindex="-1"><a class="header-anchor" href="#_2-21-services"><span>2.21 SERVICES</span></a></h3><blockquote><p>This system table is available starting from version V 2.0.8</p></blockquote><ul><li>Displays services (MQTT service, REST service) on all active DataNodes (with RUNNING or READ-ONLY status).</li><li>Table structure:</li></ul><table><thead><tr><th>Column Name</th><th>Data Type</th><th>Column Type</th><th>Description</th></tr></thead><tbody><tr><td>service_name</td><td>STRING</td><td>TAG</td><td>Service Name</td></tr><tr><td>datanode_id</td><td>INT32</td><td>ATTRIBUTE</td><td>DataNode ID where service runs</td></tr><tr><td>state</td><td>STRING</td><td>ATTRIBUTE</td><td>Service status: RUNNING/STOPPED</td></tr></tbody></table><ul><li>Query example:</li></ul><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">IoTDB</span><span style="color:#56B6C2;">&gt;</span><span style="color:#C678DD;"> SELECT</span><span style="color:#ABB2BF;"> * </span><span style="color:#C678DD;">FROM</span><span style="color:#D19A66;"> information_schema</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">services</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------+-----------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#C678DD;">service_name</span><span style="color:#ABB2BF;">|datanode_id|</span><span style="color:#C678DD;">state</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------+-----------+---------+</span></span>
<span class="line"><span style="color:#ABB2BF;">|MQTT |</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |</span><span style="color:#C678DD;">STOPPED</span><span style="color:#ABB2BF;"> |</span></span>
<span class="line"><span style="color:#ABB2BF;">|REST |</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;"> |RUNNING |</span></span>
<span class="line"><span style="color:#ABB2BF;">+</span><span style="color:#7F848E;font-style:italic;">------------+-----------+---------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="_3-permission-description" tabindex="-1"><a class="header-anchor" href="#_3-permission-description"><span>3. Permission Description</span></a></h2><ul><li>GRANT/REVOKE operations are not supported for the <code>information_schema</code> database or any of its tables.</li><li>All users can view <code>information_schema</code> database details via the <code>SHOW DATABASES</code> statement.</li><li>All users can list system tables via <code>SHOW TABLES FROM information_schema</code>.</li><li>All users can inspect system table structures using the <code>DESC</code> statement.</li></ul></div><!----><!----><!----></div><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a class="auto-link external-link vp-meta-label" href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/latest-Table/Reference/System-Tables_apache.md" aria-label="Found Error? Edit this page on GitHub" rel="noopener noreferrer" target="_blank"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon" name="edit"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->Found Error? Edit this page on GitHub<!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">Last Updated: </span><time class="vp-meta-info" datetime="2026-04-15T10:39:00.000Z" data-allow-mismatch>4/15/26, 10:39 AM</time></div><!----></div></footer><nav class="vp-page-nav"><a class="route-link auto-link prev" href="/UserGuide/latest-Table/Reference/Status-Codes.html" aria-label="Status Codes"><div class="hint"><span class="arrow start"></span>Prev</div><div class="link"><!---->Status Codes</div></a><!----></nav><!----><!----><!--]--></main><!--]--><footer class="site-footer"><span id="doc-version" style="display:none;">latest-Table</span><p class="copyright-text">Copyright © 2026 The Apache Software Foundation.
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