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<title>pg_controldata</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
<a name="app-pgcontroldata"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p>pg_controldata — display control information of a <span class="productname">PostgreSQL</span> database cluster</p>
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<a name="id809543"></a><div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="cmdsynopsis"><p><code class="command">pg_controldata</code> [<em class="replaceable"><code>datadir</code></em>]</p></div>
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<div class="refsect1" lang="en">
<a name="r1-app-pgcontroldata-1"></a><h2>Description</h2>
<p> <code class="command">pg_controldata</code> prints information initialized during
<code class="command">initdb</code>, such as the catalog version and server locale.
It also shows information about write-ahead logging and checkpoint
processing. This information is cluster-wide, and not specific to any one
database.
</p>
<p> This utility may only be run by the user who initialized the cluster because
it requires read access to the data directory.
You can specify the data directory on the command line, or use
the environment variable <code class="envar">PGDATA</code>.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id809614"></a><h2>Environment</h2>
<div class="variablelist"><dl>
<dt><span class="term"><code class="envar">PGDATA</code></span></dt>
<dd><p> Default data directory location
</p></dd>
</dl></div>
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