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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>pg_controldata</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="pgarchivecleanup.html" title="pg_archivecleanup" /><link rel="next" href="app-pg-ctl.html" title="pg_ctl" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center"><span xmlns="http://www.w3.org/1999/xhtml" class="application">pg_controldata</span></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="pgarchivecleanup.html" title="pg_archivecleanup">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="reference-server.html" title="PostgreSQL Server Applications">Up</a></td><th width="60%" align="center">PostgreSQL Server Applications</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="app-pg-ctl.html" title="pg_ctl">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="APP-PGCONTROLDATA"><div class="titlepage"></div><a id="id-1.9.5.5.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle"><span class="application">pg_controldata</span></span></h2><p>pg_controldata — display control information of a <span class="productname">PostgreSQL</span> database cluster</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p id="id-1.9.5.5.4.1"><code class="command">pg_controldata</code> [<em class="replaceable"><code>option</code></em>] [[ <code class="option">--pgdata</code> | <code class="option">-D</code> ]<em class="replaceable"><code> datadir</code></em>]</p></div></div><div class="refsect1" id="R1-APP-PGCONTROLDATA-1"><h2>Description</h2><p>
<code class="command">pg_controldata</code> prints information initialized during
<code class="command">initdb</code>, such as the catalog version.
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 can 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>. This utility supports the options
<code class="option">-V</code> and <code class="option">--version</code>, which print the
<span class="application">pg_controldata</span> version and exit. It also
supports options <code class="option">-?</code> and <code class="option">--help</code>, which output the
supported arguments.
</p></div><div class="refsect1" id="id-1.9.5.5.6"><h2>Environment</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="envar">PGDATA</code></span></dt><dd><p>
Default data directory location
</p></dd></dl></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pgarchivecleanup.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference-server.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="app-pg-ctl.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="application">pg_archivecleanup</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="application">pg_ctl</span></td></tr></table></div></body></html>
