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<h1 id="sql-set-session--page-root">SET SESSION<a class="headerlink" href="#sql-set-session--page-root" title="Permalink to this headline">#</a></h1>

<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this headline">#</a></h2>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>SET SESSION name = expression
SET SESSION catalog.name = expression
</pre></div>
</div>


<h2 id="description">Description<a class="headerlink" href="#description" title="Permalink to this headline">#</a></h2>
<p>Set a session property value or a catalog session property.</p>


<span id="session-properties-definition"></span><h2 id="session-properties">Session properties<a class="headerlink" href="#session-properties" title="Permalink to this headline">#</a></h2>
<p>A session property is a <a class="reference internal" href="../admin/properties.html"><span class="doc">configuration property</span></a> that
can be temporarily modified by a user for the duration of the current
connection session to the Trino cluster. Many configuration properties have a
corresponding session property that accepts the same values as the config
property.</p>
<p>There are two types of session properties:</p>
<ul class="simple">
<li><p><strong>System session properties</strong> apply to the whole cluster. Most session
properties are system session properties unless specified otherwise.</p></li>
<li><p><strong>Catalog session properties</strong> are connector-defined session properties that
can be set on a per-catalog basis. These properties must be set separately for
each catalog by including the catalog name as a prefix, such as
<code class="docutils literal notranslate"><span class="pre">catalogname.property_name</span></code>.</p></li>
</ul>
<p>Session properties are tied to the current session, so a user can have multiple
connections to a cluster that each have different values for the same session
properties. Once a session ends, either by disconnecting or creating a new
session, any changes made to session properties during the previous session are
lost.</p>


<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permalink to this headline">#</a></h2>
<p>The following example sets a system session property to enable optimized hash
generation:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SET</span> <span class="k">SESSION</span> <span class="n">optimize_hash_generation</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
</pre></div>
</div>
<p>The following example sets the <code class="docutils literal notranslate"><span class="pre">optimize_locality_enabled</span></code> catalog session
property for an <a class="reference internal" href="../connector/accumulo.html"><span class="doc">Accumulo catalog</span></a> named <code class="docutils literal notranslate"><span class="pre">acc01</span></code>:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SET</span> <span class="k">SESSION</span> <span class="n">acc01</span><span class="p">.</span><span class="n">optimize_locality_enabled</span> <span class="o">=</span> <span class="k">false</span><span class="p">;</span>
</pre></div>
</div>
<p>The example <code class="docutils literal notranslate"><span class="pre">acc01.optimize_locality_enabled</span></code> catalog session property
does not apply to any other catalog, even if another catalog also uses the
Accumulo connector.</p>


<h2 id="see-also">See also<a class="headerlink" href="#see-also" title="Permalink to this headline">#</a></h2>
<p><a class="reference internal" href="reset-session.html"><span class="doc">RESET SESSION</span></a>, <a class="reference internal" href="show-session.html"><span class="doc">SHOW SESSION</span></a></p>


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