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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.12.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB Introduction</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Quick Start</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Data Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>CLI</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Administration Management</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>IoTDB-SQL Language</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.12.x/IoTDB-SQL-Language/DDL-Data-Definition-Language.html" class="sidebar-link">DDL (Data Definition Language)</a></li><li><a href="/UserGuide/V0.12.x/IoTDB-SQL-Language/DML-Data-Manipulation-Language.html" class="sidebar-link">DML (Data Manipulation Language)</a></li><li><a href="/UserGuide/V0.12.x/IoTDB-SQL-Language/Maintenance-Command.html" aria-current="page" class="active sidebar-link">Maintenance Command</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>UDF</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Communication Service Protocol</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Collaboration of Edge and Cloud</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Cluster Setup</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>FAQ</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Appendix</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h2 id="maintenance-command"><a href="#maintenance-command" class="header-anchor">#</a> Maintenance Command</h2> <h3 id="flush"><a href="#flush" class="header-anchor">#</a> FLUSH</h3> <p>Persist all the data points in the memory table of the storage group to the disk, and seal the data file.</p> <p>Note: This command does not need to be invoked manually by the client. IoTDB has WAL to ensure data security |
| and IoTDB will flush when appropriate. |
| Frequently call flush can result in small data files that degrade query performance.</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> FLUSH |
| IoTDB<span class="token operator">></span> FLUSH root<span class="token punctuation">.</span>ln |
| IoTDB<span class="token operator">></span> FLUSH root<span class="token punctuation">.</span>sg1<span class="token punctuation">,</span>root<span class="token punctuation">.</span>sg2 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h3 id="merge"><a href="#merge" class="header-anchor">#</a> MERGE</h3> <p>Merge sequence and unsequence data. Currently IoTDB supports the following two types of SQL to manually trigger the merge process of data files:</p> <ul><li><code>MERGE</code> Only rewrite overlapped Chunks, the merge speed is quick, while there will be redundant data on the disk eventually.</li> <li><code>FULL MERGE</code> Rewrite all data in overlapped files, the merge speed is slow, but there will be no redundant data on the disk eventually.</li></ul> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">MERGE</span> |
| IoTDB<span class="token operator">></span> <span class="token keyword">FULL</span> <span class="token keyword">MERGE</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="clear-cache"><a href="#clear-cache" class="header-anchor">#</a> CLEAR CACHE</h3> <p>Clear the cache of chunk, chunk metadata and timeseries metadata to release the memory footprint.</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> CLEAR CACHE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="set-ststem-to-readonly-writable"><a href="#set-ststem-to-readonly-writable" class="header-anchor">#</a> SET STSTEM TO READONLY / WRITABLE</h3> <p>Manually set IoTDB system to read-only or writable mode.</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">SET</span> SYSTEM <span class="token keyword">TO</span> READONLY |
| IoTDB<span class="token operator">></span> <span class="token keyword">SET</span> SYSTEM <span class="token keyword">TO</span> WRITABLE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="schema-snapshot"><a href="#schema-snapshot" class="header-anchor">#</a> SCHEMA SNAPSHOT</h3> <p>To speed up restarting of IoTDB, users can create snapshot of schema and avoid recovering schema from mlog file.</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">CREATE</span> <span class="token keyword">SNAPSHOT</span> <span class="token keyword">FOR</span> <span class="token keyword">SCHEMA</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="kill-query"><a href="#kill-query" class="header-anchor">#</a> Kill Query</h3> <p>When using IoTDB, you may encounter the following situations: you have entered a query statement, but can not get the result for a long time, as this query contains too much data or some other reasons, and have to wait until the query ends. |
| Since version 0.12, IoTDB has provided two solutions for queries with long execution time: query timeout and query abort.</p> <h4 id="query-timeout"><a href="#query-timeout" class="header-anchor">#</a> Query timeout</h4> <p>For queries that take too long to execute, IoTDB will forcibly interrupt the query and throw a timeout exception, as shown in the figure:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>IoTDB<span class="token operator">></span> <span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> root<span class="token punctuation">;</span> |
| Msg: <span class="token number">701</span> <span class="token keyword">Current</span> query <span class="token operator">is</span> <span class="token keyword">time</span> <span class="token keyword">out</span><span class="token punctuation">,</span> please <span class="token keyword">check</span> your statement <span class="token operator">or</span> <span class="token keyword">modify</span> timeout parameter<span class="token punctuation">.</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>The default timeout of the system is 60000 ms，which can be customized in the configuration file through the <code>query_timeout_threshold</code> parameter.</p> <p>If you use JDBC or Session, we also support setting a timeout for a single query（Unit: ms）：</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">IoTDBStatement</span><span class="token punctuation">)</span> statement<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">executeQuery</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token keyword">long</span> timeoutInMS<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span><span class="token function">executeQueryStatement</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token keyword">long</span> timeout<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>If the timeout parameter is not configured or with value 0, the default timeout time will be used.</p> <h4 id="query-abort"><a href="#query-abort" class="header-anchor">#</a> Query abort</h4> <p>In addition to waiting for the query to time out passively, IoTDB also supports stopping the query actively:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">KILL</span> QUERY <span class="token operator"><</span>queryId<span class="token operator">></span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>You can abort the specified query by specifying <code>queryId</code>. If <code>queryId</code> is not specified, all executing queries will be killed.</p> <p>To get the executing <code>queryId</code>，you can use the <code>show query processlist</code> command，which will show the list of all executing queries，with the following result set：</p> <table><thead><tr><th>Time</th> <th>queryId</th> <th>statement</th></tr></thead> <tbody><tr><td></td> <td></td> <td></td></tr></tbody></table> <p>The maximum display length of statement is 64 characters. For statements with more than 64 characters, the intercepted part will be displayed.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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