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<title>19.4.Database Configuration</title>
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<a name="manage-ag-config"></a>19.4.Database Configuration</h2></div></div></div>
<p> Recall from <a href="runtime-config.html" title="Chapter17.Server Configuration">Chapter17, <i>Server Configuration</i></a> that the
<span class="productname">PostgreSQL</span> server provides a large number of
run-time configuration variables. You can set database-specific
default values for many of these settings.
</p>
<p> For example, if for some reason you want to disable the
<acronym class="acronym">GEQO</acronym> optimizer for a given database, you'd
ordinarily have to either disable it for all databases or make sure
that every connecting client is careful to issue <code class="literal">SET geqo
TO off;</code>. To make this setting the default within a particular
database, you can execute the command
</p>
<pre class="programlisting">ALTER DATABASE mydb SET geqo TO off;</pre>
<p>
This will save the setting (but not set it immediately). In
subsequent connections to this database it will appear as though
<code class="literal">SET geqo TO off;</code> had been executed just before the
session started.
Note that users can still alter this setting during their sessions; it
will only be the default. To undo any such setting, use
<code class="literal">ALTER DATABASE <em class="replaceable"><code>dbname</code></em> RESET
<em class="replaceable"><code>varname</code></em>;</code>.
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