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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 11. Indexes</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="typeconv-select.html" title="10.6. SELECT Output Columns" /><link rel="next" href="indexes-intro.html" title="11.1. Introduction" /></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 11. Indexes</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="typeconv-select.html" title="10.6. SELECT Output Columns">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql.html" title="Part II. The SQL Language">Up</a></td><th width="60%" align="center">Part II. The SQL Language</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="indexes-intro.html" title="11.1. Introduction">Next</a></td></tr></table><hr /></div><div class="chapter" id="INDEXES"><div class="titlepage"><div><div><h2 class="title">Chapter 11. Indexes</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="indexes-intro.html">11.1. Introduction</a></span></dt><dt><span class="sect1"><a href="indexes-types.html">11.2. Index Types</a></span></dt><dd><dl><dt><span class="sect2"><a href="indexes-types.html#INDEXES-TYPES-BTREE">11.2.1. B-Tree</a></span></dt><dt><span class="sect2"><a href="indexes-types.html#INDEXES-TYPES-HASH">11.2.2. Hash</a></span></dt><dt><span class="sect2"><a href="indexes-types.html#INDEXES-TYPE-GIST">11.2.3. GiST</a></span></dt><dt><span class="sect2"><a href="indexes-types.html#INDEXES-TYPE-SPGIST">11.2.4. SP-GiST</a></span></dt><dt><span class="sect2"><a href="indexes-types.html#INDEXES-TYPES-GIN">11.2.5. GIN</a></span></dt><dt><span class="sect2"><a href="indexes-types.html#INDEXES-TYPES-BRIN">11.2.6. BRIN</a></span></dt></dl></dd><dt><span class="sect1"><a href="indexes-multicolumn.html">11.3. Multicolumn Indexes</a></span></dt><dt><span class="sect1"><a href="indexes-ordering.html">11.4. Indexes and <code class="literal">ORDER BY</code></a></span></dt><dt><span class="sect1"><a href="indexes-bitmap-scans.html">11.5. Combining Multiple Indexes</a></span></dt><dt><span class="sect1"><a href="indexes-unique.html">11.6. Unique Indexes</a></span></dt><dt><span class="sect1"><a href="indexes-expressional.html">11.7. Indexes on Expressions</a></span></dt><dt><span class="sect1"><a href="indexes-partial.html">11.8. Partial Indexes</a></span></dt><dt><span class="sect1"><a href="indexes-index-only-scans.html">11.9. Index-Only Scans and Covering Indexes</a></span></dt><dt><span class="sect1"><a href="indexes-opclass.html">11.10. Operator Classes and Operator Families</a></span></dt><dt><span class="sect1"><a href="indexes-collations.html">11.11. Indexes and Collations</a></span></dt><dt><span class="sect1"><a href="indexes-examine.html">11.12. Examining Index Usage</a></span></dt></dl></div><a id="id-1.5.10.2" class="indexterm"></a><p>
Indexes are a common way to enhance database performance. An index
allows the database server to find and retrieve specific rows much
faster than it could do without an index. But indexes also add
overhead to the database system as a whole, so they should be used
sensibly.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="typeconv-select.html" title="10.6. SELECT Output Columns">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql.html" title="Part II. The SQL Language">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="indexes-intro.html" title="11.1. Introduction">Next</a></td></tr><tr><td width="40%" align="left" valign="top">10.6. <code class="literal">SELECT</code> Output Columns </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 11.1. Introduction</td></tr></table></div></body></html>
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