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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/monitoring-metrics/system-views.adoc" target="_blank">Edit</a>
<h1>System Views</h1>
<div id="preamble">
<div class="sectionbody">
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<div class="title">Warning</div>
</td>
<td class="content">
The system views are an experimental feature and can be changed in future releases.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Ignite provides a number of built-in SQL views that contain information about cluster nodes and node metrics.
The views are available in the SYS schema.
See the <a href="/docs/2.9.0/SQL/schemas">Understanding Schemas</a> page for the information on how to access a non-default schema.</p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<div class="title">Important</div>
</td>
<td class="content">
<h3 id="limitations" class="discrete">Limitations</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>You cannot create objects in the SYS schema.</p>
</li>
<li>
<p>System views from the SYS schema cannot be joined with user tables.</p>
</li>
</ol>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="querying-system-views">Querying System Views</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To query the system views using the <a href="/docs/2.9.0/tools/sqlline">SQLLine</a> tool, connect to the SYS schema as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="shell">./sqlline.sh <span class="nt">-u</span> jdbc:ignite:thin://127.0.0.1/SYS</code></pre>
</div>
</div>
<div class="paragraph">
<p>If your node is running on a remote server, replace <code>127.0.0.1</code> with the IP address of the server.</p>
</div>
<div class="paragraph">
<p>Run a query:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="c1">-- get the list of nodes</span>
<span class="k">select</span> <span class="o">*</span> <span class="k">from</span> <span class="n">NODES</span><span class="p">;</span>
<span class="c1">-- view the CPU load as a percentage for a specific node</span>
<span class="k">select</span> <span class="n">CUR_CPU_LOAD</span> <span class="o">*</span> <span class="mi">100</span> <span class="k">from</span> <span class="n">NODE_METRICS</span> <span class="k">where</span> <span class="n">NODE_ID</span> <span class="o">=</span> <span class="s1">'a1b77663-b37f-4ddf-87a6-1e2d684f3bae'</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The same example using <a href="/docs/2.9.0/thin-clients/java-thin-client">Java Thin Client</a>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">ClientConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">ClientConfiguration</span><span class="o">().</span><span class="na">setAddresses</span><span class="o">(</span><span class="s">"127.0.0.1:10800"</span><span class="o">);</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">IgniteClient</span> <span class="n">igniteClient</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">startClient</span><span class="o">(</span><span class="n">cfg</span><span class="o">))</span> <span class="o">{</span>
<span class="c1">// getting the id of the first node</span>
<span class="no">UUID</span> <span class="n">nodeId</span> <span class="o">=</span> <span class="o">(</span><span class="no">UUID</span><span class="o">)</span> <span class="n">igniteClient</span><span class="o">.</span><span class="na">query</span><span class="o">(</span><span class="k">new</span> <span class="nc">SqlFieldsQuery</span><span class="o">(</span><span class="s">"SELECT * from NODES"</span><span class="o">).</span><span class="na">setSchema</span><span class="o">(</span><span class="s">"IGNITE"</span><span class="o">))</span>
<span class="o">.</span><span class="na">getAll</span><span class="o">().</span><span class="na">iterator</span><span class="o">().</span><span class="na">next</span><span class="o">().</span><span class="na">get</span><span class="o">(</span><span class="mi">0</span><span class="o">);</span>
<span class="kt">double</span> <span class="n">cpu_load</span> <span class="o">=</span> <span class="o">(</span><span class="nc">Double</span><span class="o">)</span> <span class="n">igniteClient</span>
<span class="o">.</span><span class="na">query</span><span class="o">(</span><span class="k">new</span> <span class="nc">SqlFieldsQuery</span><span class="o">(</span><span class="s">"select CUR_CPU_LOAD * 100 from NODE_METRICS where NODE_ID = ? "</span><span class="o">)</span>
<span class="o">.</span><span class="na">setSchema</span><span class="o">(</span><span class="s">"IGNITE"</span><span class="o">).</span><span class="na">setArgs</span><span class="o">(</span><span class="n">nodeId</span><span class="o">.</span><span class="na">toString</span><span class="o">()))</span>
<span class="o">.</span><span class="na">getAll</span><span class="o">().</span><span class="na">iterator</span><span class="o">().</span><span class="na">next</span><span class="o">().</span><span class="na">get</span><span class="o">(</span><span class="mi">0</span><span class="o">);</span>
<span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"node's cpu load = "</span> <span class="o">+</span> <span class="n">cpu_load</span><span class="o">);</span>
<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">ClientException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">System</span><span class="o">.</span><span class="na">err</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">e</span><span class="o">.</span><span class="na">getMessage</span><span class="o">());</span>
<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">Exception</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">System</span><span class="o">.</span><span class="na">err</span><span class="o">.</span><span class="na">format</span><span class="o">(</span><span class="s">"Unexpected failure: %s\n"</span><span class="o">,</span> <span class="n">e</span><span class="o">);</span>
<span class="o">}</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="caches">CACHES</h2>
<div class="sectionbody">
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 28.5714%;">
<col style="width: 14.2857%;">
<col style="width: 57.1429%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Column</th>
<th class="tableblock halign-left valign-top">Type</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_NAME</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Cache name</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_ID</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">int</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Cache ID</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_TYPE</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Cache type</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_MODE</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Cache mode</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">ATOMICITY_MODE</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Atomicity mode</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_GROUP_NAME</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Cache group name</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">AFFINITY</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of affinity function</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">AFFINITY_MAPPER</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of affinity mapper</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">BACKUPS</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">int</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">backup count</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_GROUP_ID</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">int</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">cache group id</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_LOADER_FACTORY</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of cache loader factory</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_STORE_FACTORY</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of cache store factory</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">CACHE_WRITER_FACTORY</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of cache writer factory</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">DATA_REGION_NAME</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Data region name</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">DEFAULT_LOCK_TIMEOUT</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">long</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Lock timeout in milliseconds</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">EVICTION_FILTER</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of eviction filter</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">EVICTION_POLICY_FACTORY</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of eviction policy factory</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">EXPIRY_POLICY_FACTORY</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of expiry policy factory</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">INTERCEPTOR</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">toString representation of interceptor</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_COPY_ON_READ</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Flag indicating whether a copy of the value stored in the on-heap cache</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_EAGER_TTL</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Flag indicating whether expired cache entries will be eagerly removed from cache</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_ENCRYPTION_ENABLED</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if cache data encrypted</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_EVENTS_DISABLED</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if events disabled for this cache</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_INVALIDATE</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if values will be invalidated (nullified) upon commit in near cache</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_LOAD_PREVIOUS_VALUE</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if value should be loaded from store if it is not in the cache</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_MANAGEMENT_ENABLED</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_NEAR_CACHE_ENABLED</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if near cache enabled</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_ONHEAP_CACHE_ENABLED</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if on heap cache enabled</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_READ_FROM_BACKUP</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if read operation should be performed from backup node</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_READ_THROUGH</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">True if read from third party storage enabled</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_SQL_ESCAPE_ALL</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">If true all the SQL table and field names will be escaped with double quotes</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IS_SQL_ONHEAP_CACHE_ENABLED</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
<td