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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 73. Database Physical Storage</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="hash-implementation.html" title="72.2. Implementation" /><link rel="next" href="storage-file-layout.html" title="73.1. Database File 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">Chapter 73. Database Physical Storage</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="hash-implementation.html" title="72.2. Implementation">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><th width="60%" align="center">Part VII. Internals</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="storage-file-layout.html" title="73.1. Database File Layout">Next</a></td></tr></table><hr /></div><div class="chapter" id="STORAGE"><div class="titlepage"><div><div><h2 class="title">Chapter 73. Database Physical Storage</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="storage-file-layout.html">73.1. Database File Layout</a></span></dt><dt><span class="sect1"><a href="storage-toast.html">73.2. TOAST</a></span></dt><dd><dl><dt><span class="sect2"><a href="storage-toast.html#STORAGE-TOAST-ONDISK">73.2.1. Out-of-Line, On-Disk TOAST Storage</a></span></dt><dt><span class="sect2"><a href="storage-toast.html#STORAGE-TOAST-INMEMORY">73.2.2. Out-of-Line, In-Memory TOAST Storage</a></span></dt></dl></dd><dt><span class="sect1"><a href="storage-fsm.html">73.3. Free Space Map</a></span></dt><dt><span class="sect1"><a href="storage-vm.html">73.4. Visibility Map</a></span></dt><dt><span class="sect1"><a href="storage-init.html">73.5. The Initialization Fork</a></span></dt><dt><span class="sect1"><a href="storage-page-layout.html">73.6. Database Page Layout</a></span></dt><dd><dl><dt><span class="sect2"><a href="storage-page-layout.html#STORAGE-TUPLE-LAYOUT">73.6.1. Table Row Layout</a></span></dt></dl></dd><dt><span class="sect1"><a href="storage-hot.html">73.7. Heap-Only Tuples (<acronym class="acronym">HOT</acronym>)</a></span></dt></dl></div><p>
This chapter provides an overview of the physical storage format used by
<span class="productname">PostgreSQL</span> databases.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hash-implementation.html" title="72.2. Implementation">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="storage-file-layout.html" title="73.1. Database File Layout">Next</a></td></tr><tr><td width="40%" align="left" valign="top">72.2. Implementation </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 73.1. Database File Layout</td></tr></table></div></body></html>
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