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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>Chapter 51. Archive Modules</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="replication-origins.html" title="Chapter 50. Replication Progress Tracking" /><link rel="next" href="archive-module-init.html" title="51.1. Initialization Functions" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 51. Archive Modules</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="replication-origins.html" title="Chapter 50. Replication Progress Tracking">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><th width="60%" align="center">Part V. Server Programming</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="archive-module-init.html" title="51.1. Initialization Functions">Next</a></td></tr></table><hr /></div><div class="chapter" id="ARCHIVE-MODULES"><div class="titlepage"><div><div><h2 class="title">Chapter 51. Archive Modules</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="archive-module-init.html">51.1. Initialization Functions</a></span></dt><dt><span class="sect1"><a href="archive-module-callbacks.html">51.2. Archive Module Callbacks</a></span></dt><dd><dl><dt><span class="sect2"><a href="archive-module-callbacks.html#ARCHIVE-MODULE-CHECK">51.2.1. Check Callback</a></span></dt><dt><span class="sect2"><a href="archive-module-callbacks.html#ARCHIVE-MODULE-ARCHIVE">51.2.2. Archive Callback</a></span></dt><dt><span class="sect2"><a href="archive-module-callbacks.html#ARCHIVE-MODULE-SHUTDOWN">51.2.3. Shutdown Callback</a></span></dt></dl></dd></dl></div><a id="id-1.8.16.2" class="indexterm"></a><p>
+  PostgreSQL provides infrastructure to create custom modules for continuous
+  archiving (see <a class="xref" href="continuous-archiving.html" title="26.3. Continuous Archiving and Point-in-Time Recovery (PITR)">Section 26.3</a>).  While archiving via
+  a shell command (i.e., <a class="xref" href="runtime-config-wal.html#GUC-ARCHIVE-COMMAND">archive_command</a>) is much
+  simpler, a custom archive module will often be considerably more robust and
+  performant.
+ </p><p>
+  When a custom <a class="xref" href="runtime-config-wal.html#GUC-ARCHIVE-LIBRARY">archive_library</a> is configured, PostgreSQL
+  will submit completed WAL files to the module, and the server will avoid
+  recycling or removing these WAL files until the module indicates that the files
+  were successfully archived.  It is ultimately up to the module to decide what
+  to do with each WAL file, but many recommendations are listed at
+  <a class="xref" href="continuous-archiving.html#BACKUP-ARCHIVING-WAL" title="26.3.1. Setting Up WAL Archiving">Section 26.3.1</a>.
+ </p><p>
+  Archiving modules must at least consist of an initialization function (see
+  <a class="xref" href="archive-module-init.html" title="51.1. Initialization Functions">Section 51.1</a>) and the required callbacks (see
+  <a class="xref" href="archive-module-callbacks.html" title="51.2. Archive Module Callbacks">Section 51.2</a>).  However, archive modules are
+  also permitted to do much more (e.g., declare GUCs and register background
+  workers).
+ </p><p>
+  The <code class="filename">contrib/basic_archive</code> module contains a working
+  example, which demonstrates some useful techniques.
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="replication-origins.html" title="Chapter 50. Replication Progress Tracking">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="archive-module-init.html" title="51.1. Initialization Functions">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 50. Replication Progress Tracking </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 51.1. Initialization Functions</td></tr></table></div></body></html>
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