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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!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_checksums</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 V1.79.1" /><link rel="prev" href="pgarchivecleanup.html" title="pg_archivecleanup" /><link rel="next" href="app-pgcontroldata.html" title="pg_controldata" /></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_checksums</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 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="app-pgcontroldata.html" title="pg_controldata">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="APP-PGCHECKSUMS"><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_checksums</span></span></h2><p>pg_checksums — enable, disable or check data checksums in 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_checksums</code> [<em class="replaceable"><code>option</code></em>...] [[ <code class="option">-D</code>  |   <code class="option">--pgdata</code> ]<em class="replaceable"><code> datadir</code></em>]</p></div></div><div class="refsect1" id="R1-APP-PG_CHECKSUMS-1"><h2>Description</h2><p>

  3.    <span class="application">pg_checksums</span> checks, enables or disables data

  4.    checksums in a <span class="productname">PostgreSQL</span> cluster.  The server

  5.    must be shut down cleanly before running

  6.    <span class="application">pg_checksums</span>. When verifying checksums, the exit

  7.    status is zero if there are no checksum errors, and nonzero if at least one

  8.    checksum failure is detected. When enabling or disabling checksums, the

  9.    exit status is nonzero if the operation failed.

  10.   </p><p>

  11.    When verifying checksums, every file in the cluster is scanned. When

  12.    enabling checksums, every file in the cluster is rewritten. Disabling

  13.    checksums only updates the file <code class="filename">pg_control</code>.

  14.   </p></div><div class="refsect1" id="id-1.9.5.5.6"><h2>Options</h2><p>

  15.     The following command-line options are available:

  16. 

  17.     </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">-D <em class="replaceable"><code>directory</code></em></code><br /></span><span class="term"><code class="option">--pgdata=<em class="replaceable"><code>directory</code></em></code></span></dt><dd><p>

  18.         Specifies the directory where the database cluster is stored.

  19.        </p></dd><dt><span class="term"><code class="option">-c</code><br /></span><span class="term"><code class="option">--check</code></span></dt><dd><p>

  20.         Checks checksums. This is the default mode if nothing else is

  21.         specified.

  22.        </p></dd><dt><span class="term"><code class="option">-d</code><br /></span><span class="term"><code class="option">--disable</code></span></dt><dd><p>

  23.         Disables checksums.

  24.        </p></dd><dt><span class="term"><code class="option">-e</code><br /></span><span class="term"><code class="option">--enable</code></span></dt><dd><p>

  25.         Enables checksums.

  26.        </p></dd><dt><span class="term"><code class="option">-f <em class="replaceable"><code>filenode</code></em></code><br /></span><span class="term"><code class="option">--filenode=<em class="replaceable"><code>filenode</code></em></code></span></dt><dd><p>

  27.         Only validate checksums in the relation with filenode

  28.         <em class="replaceable"><code>filenode</code></em>. 

  29.        </p></dd><dt><span class="term"><code class="option">-N</code><br /></span><span class="term"><code class="option">--no-sync</code></span></dt><dd><p>

  30.         By default, <code class="command">pg_checksums</code> will wait for all files

  31.         to be written safely to disk.  This option causes

  32.         <code class="command">pg_checksums</code> to return without waiting, which is

  33.         faster, but means that a subsequent operating system crash can leave

  34.         the updated data directory corrupt.  Generally, this option is useful

  35.         for testing but should not be used on a production installation.

  36.         This option has no effect when using <code class="literal">--check</code>.

  37.        </p></dd><dt><span class="term"><code class="option">-P</code><br /></span><span class="term"><code class="option">--progress</code></span></dt><dd><p>

  38.         Enable progress reporting. Turning this on will deliver a progress

  39.         report while checking or enabling checksums.

  40.        </p></dd><dt><span class="term"><code class="option">-v</code><br /></span><span class="term"><code class="option">--verbose</code></span></dt><dd><p>

  41.         Enable verbose output. Lists all checked files.

  42.        </p></dd><dt><span class="term"><code class="option">-V</code><br /></span><span class="term"><code class="option">--version</code></span></dt><dd><p>

  43.         Print the <span class="application">pg_checksums</span> version and exit.

  44.        </p></dd><dt><span class="term"><code class="option">-?</code><br /></span><span class="term"><code class="option">--help</code></span></dt><dd><p>

  45.          Show help about <span class="application">pg_checksums</span> command line

  46.          arguments, and exit.

  47.         </p></dd></dl></div><p>

  48.    </p></div><div class="refsect1" id="id-1.9.5.5.7"><h2>Environment</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="envar">PGDATA</code></span></dt><dd><p>

  49.       Specifies the directory where the database cluster is

  50.       stored; can be overridden using the <code class="option">-D</code> option.

  51.      </p></dd><dt><span class="term"><code class="envar">PG_COLOR</code></span></dt><dd><p>

  52.       Specifies whether to use color in diagnostic messages. Possible values

  53.       are <code class="literal">always</code>, <code class="literal">auto</code> and

  54.       <code class="literal">never</code>.

  55.      </p></dd></dl></div></div><div class="refsect1" id="id-1.9.5.5.8"><h2>Notes</h2><p>

  56.    Enabling checksums in a large cluster can potentially take a long time.

  57.    During this operation, the cluster or other programs that write to the

  58.    data directory must not be started or else data loss may occur.

  59.   </p><p>

  60.    When using a replication setup with tools which perform direct copies

  61.    of relation file blocks (for example <a class="xref" href="app-pgrewind.html" title="pg_rewind"><span class="refentrytitle"><span class="application">pg_rewind</span></span></a>),

  62.    enabling or disabling checksums can lead to page corruptions in the

  63.    shape of incorrect checksums if the operation is not done consistently

  64.    across all nodes. When enabling or disabling checksums in a replication

  65.    setup, it is thus recommended to stop all the clusters before switching

  66.    them all consistently. Destroying all standbys, performing the operation

  67.    on the primary and finally recreating the standbys from scratch is also

  68.    safe.

  69.   </p><p>

  70.    If <span class="application">pg_checksums</span> is aborted or killed while

  71.    enabling or disabling checksums, the cluster's data checksum configuration

  72.    remains unchanged, and <span class="application">pg_checksums</span> can be

  73.    re-run to perform the same operation.

  74.   </p></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-pgcontroldata.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_controldata</span></td></tr></table></div></body></html>
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