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13 июл 2026, 17:47
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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>66.5. The Initialization Fork</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="storage-vm.html" title="66.4. Visibility Map" /><link rel="next" href="storage-page-layout.html" title="66.6. Database Page Layout" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">66.5. The Initialization Fork</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="storage-vm.html" title="66.4. Visibility Map">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="storage.html" title="Chapter 66. Database Physical Storage">Up</a></td><th width="60%" align="center">Chapter 66. Database Physical Storage</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 18.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="storage-page-layout.html" title="66.6. Database Page Layout">Next</a></td></tr></table><hr /></div><div class="sect1" id="STORAGE-INIT"><div class="titlepage"><div><div><h2 class="title" style="clear: both">66.5. The Initialization Fork <a href="#STORAGE-INIT" class="id_link">#</a></h2></div></div></div><a id="id-1.10.18.7.2" class="indexterm"></a><p>
Each unlogged table, and each index on an unlogged table, has an initialization
fork.  The initialization fork is an empty table or index of the appropriate
type.  When an unlogged table must be reset to empty due to a crash, the
initialization fork is copied over the main fork, and any other forks are
erased (they will be recreated automatically as needed).
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="storage-vm.html" title="66.4. Visibility Map">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="storage.html" title="Chapter 66. Database Physical Storage">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="storage-page-layout.html" title="66.6. Database Page Layout">Next</a></td></tr><tr><td width="40%" align="left" valign="top">66.4. Visibility Map </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 18.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 66.6. Database Page Layout</td></tr></table></div></body></html>