<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!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 14. Performance Tips</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="locking-indexes.html" title="13.6. Locking and Indexes" /><link rel="next" href="using-explain.html" title="14.1. Using EXPLAIN" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 14. Performance Tips</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="locking-indexes.html" title="13.6. Locking and Indexes">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 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="using-explain.html" title="14.1. Using EXPLAIN">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="PERFORMANCE-TIPS"><div class="titlepage"><div><div><h2 class="title">Chapter 14. Performance Tips</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="using-explain.html">14.1. Using <code class="command">EXPLAIN</code></a></span></dt><dd><dl><dt><span class="sect2"><a href="using-explain.html#USING-EXPLAIN-BASICS">14.1.1. <code class="command">EXPLAIN</code> Basics</a></span></dt><dt><span class="sect2"><a href="using-explain.html#USING-EXPLAIN-ANALYZE">14.1.2. <code class="command">EXPLAIN ANALYZE</code></a></span></dt><dt><span class="sect2"><a href="using-explain.html#USING-EXPLAIN-CAVEATS">14.1.3. Caveats</a></span></dt></dl></dd><dt><span class="sect1"><a href="planner-stats.html">14.2. Statistics Used by the Planner</a></span></dt><dd><dl><dt><span class="sect2"><a href="planner-stats.html#id-1.5.13.5.3">14.2.1. Single-Column Statistics</a></span></dt><dt><span class="sect2"><a href="planner-stats.html#PLANNER-STATS-EXTENDED">14.2.2. Extended Statistics</a></span></dt></dl></dd><dt><span class="sect1"><a href="explicit-joins.html">14.3. Controlling the Planner with Explicit <code class="literal">JOIN</code> Clauses</a></span></dt><dt><span class="sect1"><a href="populate.html">14.4. Populating a Database</a></span></dt><dd><dl><dt><span class="sect2"><a href="populate.html#DISABLE-AUTOCOMMIT">14.4.1. Disable Autocommit</a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-COPY-FROM">14.4.2. Use <code class="command">COPY</code></a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-RM-INDEXES">14.4.3. Remove Indexes</a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-RM-FKEYS">14.4.4. Remove Foreign Key Constraints</a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-WORK-MEM">14.4.5. Increase <code class="varname">maintenance_work_mem</code></a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-MAX-WAL-SIZE">14.4.6. Increase <code class="varname">max_wal_size</code></a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-PITR">14.4.7. Disable WAL Archival and Streaming Replication</a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-ANALYZE">14.4.8. Run <code class="command">ANALYZE</code> Afterwards</a></span></dt><dt><span class="sect2"><a href="populate.html#POPULATE-PG-DUMP">14.4.9. Some Notes About <span class="application">pg_dump</span></a></span></dt></dl></dd><dt><span class="sect1"><a href="non-durability.html">14.5. Non-Durable Settings</a></span></dt></dl></div><a id="id-1.5.13.2" class="indexterm"></a><p> Query performance can be affected by many things. Some of these can be controlled by the user, while others are fundamental to the underlying design of the system. This chapter provides some hints about understanding and tuning <span class="productname">PostgreSQL</span> performance. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="locking-indexes.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="using-explain.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">13.6. Locking and Indexes </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 14.1. Using <code class="command">EXPLAIN</code></td></tr></table></div></body></html>
