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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 15.5 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 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 11.1. Introduction</td></tr></table></div></body></html>
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