430/connector/system.html


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        <li class="md-nav__item"><a href="#configuration" class="md-nav__link">Configuration</a>
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        <li class="md-nav__item"><a href="#using-the-system-connector" class="md-nav__link">Using the System connector</a>
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  <section id="system-connector">
<h1 id="connector-system--page-root">System connector<a class="headerlink" href="#connector-system--page-root" title="Permalink to this heading">#</a></h1>
<p>The System connector provides information and metrics about the currently
running Trino cluster. It makes this available via normal SQL queries.</p>
<section id="configuration">
<h2 id="configuration">Configuration<a class="headerlink" href="#configuration" title="Permalink to this heading">#</a></h2>
<p>The System connector doesn’t need to be configured: it is automatically
available via a catalog named <code class="docutils literal notranslate"><span class="pre">system</span></code>.</p>
</section>
<section id="using-the-system-connector">
<h2 id="using-the-system-connector">Using the System connector<a class="headerlink" href="#using-the-system-connector" title="Permalink to this heading">#</a></h2>
<p>List the available system schemas:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SHOW</span> <span class="n">SCHEMAS</span> <span class="k">FROM</span> <span class="k">system</span><span class="p">;</span>
</pre></div>
</div>
<p>List the tables in one of the schemas:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SHOW</span> <span class="n">TABLES</span> <span class="k">FROM</span> <span class="k">system</span><span class="p">.</span><span class="n">runtime</span><span class="p">;</span>
</pre></div>
</div>
<p>Query one of the tables:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="k">system</span><span class="p">.</span><span class="n">runtime</span><span class="p">.</span><span class="n">nodes</span><span class="p">;</span>
</pre></div>
</div>
<p>Kill a running query:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CALL</span> <span class="k">system</span><span class="p">.</span><span class="n">runtime</span><span class="p">.</span><span class="n">kill_query</span><span class="p">(</span><span class="n">query_id</span> <span class="o">=&gt;</span> <span class="s1">'20151207_215727_00146_tx3nr'</span><span class="p">,</span> <span class="n">message</span> <span class="o">=&gt;</span> <span class="s1">'Using too many resources'</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="system-connector-tables">
<h2 id="system-connector-tables">System connector tables<a class="headerlink" href="#system-connector-tables" title="Permalink to this heading">#</a></h2>
<section id="metadata-catalogs">
<h3 id="metadata-catalogs"><code class="docutils literal notranslate"><span class="pre">metadata.catalogs</span></code><a class="headerlink" href="#metadata-catalogs" title="Permalink to this heading">#</a></h3>
<p>The catalogs table contains the list of available catalogs.</p>
</section>
<section id="metadata-schema-properties">
<h3 id="metadata-schema-properties"><code class="docutils literal notranslate"><span class="pre">metadata.schema_properties</span></code><a class="headerlink" href="#metadata-schema-properties" title="Permalink to this heading">#</a></h3>
<p>The schema properties table contains the list of available properties
that can be set when creating a new schema.</p>
</section>
<section id="metadata-table-properties">
<h3 id="metadata-table-properties"><code class="docutils literal notranslate"><span class="pre">metadata.table_properties</span></code><a class="headerlink" href="#metadata-table-properties" title="Permalink to this heading">#</a></h3>
<p>The table properties table contains the list of available properties
that can be set when creating a new table.</p>
</section>
<section id="metadata-materialized-views">
<span id="system-metadata-materialized-views"></span><h3 id="metadata-materialized-views"><code class="docutils literal notranslate"><span class="pre">metadata.materialized_views</span></code><a class="headerlink" href="#metadata-materialized-views" title="Permalink to this heading">#</a></h3>
<p>The materialized views table contains the following information about all
<a class="reference internal" href="../language/sql-support.html#sql-materialized-view-management"><span class="std std-ref">materialized views</span></a>:</p>
<table id="id1">
<caption><span class="caption-text">Metadata for materialized views</span><a class="headerlink" href="#id1" title="Permalink to this table">#</a></caption>
<colgroup>
<col style="width: 30%"/>
<col style="width: 70%"/>
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Column</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">catalog_name</span></code></p></td>
<td><p>Name of the catalog containing the materialized view.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">schema_name</span></code></p></td>
<td><p>Name of the schema in <code class="docutils literal notranslate"><span class="pre">catalog_name</span></code> containing the materialized view.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">name</span></code></p></td>
<td><p>Name of the materialized view.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">storage_catalog</span></code></p></td>
<td><p>Name of the catalog used for the storage table backing the materialized
view.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">storage_schema</span></code></p></td>
<td><p>Name of the schema in <code class="docutils literal notranslate"><span class="pre">storage_catalog</span></code> used for the storage table
backing the materialized view.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">storage_table</span></code></p></td>
<td><p>Name of the storage table backing the materialized view.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">freshness</span></code></p></td>
<td><p>Freshness of data in the storage table. Queries on the
materialized view access the storage table if not <code class="docutils literal notranslate"><span class="pre">STALE</span></code>, otherwise
the <code class="docutils literal notranslate"><span class="pre">definition</span></code> is used to access the underlying data in the source
tables.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">owner</span></code></p></td>
<td><p>Username of the creator and owner of the materialized view.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">comment</span></code></p></td>
<td><p>User supplied text about the materialized view.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">definition</span></code></p></td>
<td><p>SQL query that defines the data provided by the materialized view.</p></td>
</tr>
</tbody>
</table>
</section>
<section id="metadata-materialized-view-properties">
<h3 id="metadata-materialized-view-properties"><code class="docutils literal notranslate"><span class="pre">metadata.materialized_view_properties</span></code><a class="headerlink" href="#metadata-materialized-view-properties" title="Permalink to this heading">#</a></h3>
<p>The materialized view properties table contains the list of available properties
that can be set when creating a new materialized view.</p>
</section>
<section id="metadata-table-comments">
<h3 id="metadata-table-comments"><code class="docutils literal notranslate"><span class="pre">metadata.table_comments</span></code><a class="headerlink" href="#metadata-table-comments" title="Permalink to this heading">#</a></h3>
<p>The table comments table contains the list of table comment.</p>
</section>
<section id="runtime-nodes">
<h3 id="runtime-nodes"><code class="docutils literal notranslate"><span class="pre">runtime.nodes</span></code><a class="headerlink" href="#runtime-nodes" title="Permalink to this heading">#</a></h3>
<p>The nodes table contains the list of visible nodes in the Trino
cluster along with their status.</p>
</section>
<section id="runtime-optimizer-rule-stats">
<span id="optimizer-rule-stats"></span><h3 id="runtime-optimizer-rule-stats"><code class="docutils literal notranslate"><span class="pre">runtime.optimizer_rule_stats</span></code><a class="headerlink" href="#runtime-optimizer-rule-stats" title="Permalink to this heading">#</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">optimizer_rule_stats</span></code> table contains the statistics for optimizer
rule invocations during the query planning phase. The statistics are
aggregated over all queries since the server start-up. The table contains
information about invocation frequency, failure rates and performance for
optimizer rules. For example, you can look at the multiplication of columns
<code class="docutils literal notranslate"><span class="pre">invocations</span></code> and <code class="docutils literal notranslate"><span class="pre">average_time</span></code> to get an idea about which rules
generally impact query planning times the most.</p>
</section>
<section id="runtime-queries">
<h3 id="runtime-queries"><code class="docutils literal notranslate"><span class="pre">runtime.queries</span></code><a class="headerlink" href="#runtime-queries" title="Permalink to this heading">#</a></h3>
<p>The queries table contains information about currently and recently
running queries on the Trino cluster. From this table you can find out
the original query SQL text, the identity of the user who ran the query,
and performance information about the query, including how long the query
was queued and analyzed.</p>
</section>
<section id="runtime-tasks">
<h3 id="runtime-tasks"><code class="docutils literal notranslate"><span class="pre">runtime.tasks</span></code><a class="headerlink" href="#runtime-tasks" title="Permalink to this heading">#</a></h3>
<p>The tasks table contains information about the tasks involved in a
Trino query, including where they were executed, and how many rows
and bytes each task processed.</p>
</section>
<section id="runtime-transactions">
<h3 id="runtime-transactions"><code class="docutils literal notranslate"><span class="pre">runtime.transactions</span></code><a class="headerlink" href="#runtime-transactions" title="Permalink to this heading">#</a></h3>
<p>The transactions table contains the list of currently open transactions
and related metadata. This includes information such as the create time,
idle time, initialization parameters, and accessed catalogs.</p>
</section>
</section>
<section id="system-connector-procedures">
<h2 id="system-connector-procedures">System connector procedures<a class="headerlink" href="#system-connector-procedures" title="Permalink to this heading">#</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="runtime.kill_query">
<span class="sig-prename descclassname"><span class="pre">runtime.</span></span><span class="sig-name descname"><span class="pre">kill_query</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">query_id</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">message</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#runtime.kill_query" title="Permalink to this definition">#</a></dt>
<dd><p>Kill the query identified by <code class="docutils literal notranslate"><span class="pre">query_id</span></code>. The query failure message
includes the specified <code class="docutils literal notranslate"><span class="pre">message</span></code>. <code class="docutils literal notranslate"><span class="pre">message</span></code> is optional.</p>
</dd></dl>
</section>
<section id="type-mapping">
<span id="system-type-mapping"></span><h2 id="type-mapping">Type mapping<a class="headerlink" href="#type-mapping" title="Permalink to this heading">#</a></h2>
<p>Trino supports all data types used within the System schemas so no mapping
is required.</p>
</section>
<section id="sql-support">
<span id="system-sql-support"></span><h2 id="sql-support">SQL support<a class="headerlink" href="#sql-support" title="Permalink to this heading">#</a></h2>
<p>The connector provides <a class="reference internal" href="../language/sql-support.html#sql-globally-available"><span class="std std-ref">globally available</span></a> and
<a class="reference internal" href="../language/sql-support.html#sql-read-operations"><span class="std std-ref">read operation</span></a> statements to access Trino system
data and metadata.</p>
</section>
</section>


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