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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Performance Tips</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="The SQL Language" HREF="sql.html"><LINK REL="PREVIOUS" TITLE="Locking and Indexes" HREF="locking-indexes.html"><LINK REL="NEXT" TITLE="Using EXPLAIN" HREF="using-explain.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="CHAPTER" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Locking and Indexes" HREF="locking-indexes.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Using EXPLAIN" HREF="using-explain.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="PERFORMANCE-TIPS" ></A >Chapter 14. Performance Tips</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT >14.1. <A HREF="using-explain.html" >Using <TT CLASS="COMMAND" >EXPLAIN</TT ></A ></DT ><DD ><DL ><DT >14.1.1. <A HREF="using-explain.html#USING-EXPLAIN-BASICS" ><TT CLASS="COMMAND" >EXPLAIN</TT > Basics</A ></DT ><DT >14.1.2. <A HREF="using-explain.html#USING-EXPLAIN-ANALYZE" ><TT CLASS="COMMAND" >EXPLAIN ANALYZE</TT ></A ></DT ><DT >14.1.3. <A HREF="using-explain.html#USING-EXPLAIN-CAVEATS" >Caveats</A ></DT ></DL ></DD ><DT >14.2. <A HREF="planner-stats.html" >Statistics Used by the Planner</A ></DT ><DT >14.3. <A HREF="explicit-joins.html" >Controlling the Planner with Explicit <TT CLASS="LITERAL" >JOIN</TT > Clauses</A ></DT ><DT >14.4. <A HREF="populate.html" >Populating a Database</A ></DT ><DD ><DL ><DT >14.4.1. <A HREF="populate.html#DISABLE-AUTOCOMMIT" >Disable Autocommit</A ></DT ><DT >14.4.2. <A HREF="populate.html#POPULATE-COPY-FROM" >Use <TT CLASS="COMMAND" >COPY</TT ></A ></DT ><DT >14.4.3. <A HREF="populate.html#POPULATE-RM-INDEXES" >Remove Indexes</A ></DT ><DT >14.4.4. <A HREF="populate.html#POPULATE-RM-FKEYS" >Remove Foreign Key Constraints</A ></DT ><DT >14.4.5. <A HREF="populate.html#POPULATE-WORK-MEM" >Increase <TT CLASS="VARNAME" >maintenance_work_mem</TT ></A ></DT ><DT >14.4.6. <A HREF="populate.html#POPULATE-CHECKPOINT-SEGMENTS" >Increase <TT CLASS="VARNAME" >checkpoint_segments</TT ></A ></DT ><DT >14.4.7. <A HREF="populate.html#POPULATE-PITR" >Disable WAL Archival and Streaming Replication</A ></DT ><DT >14.4.8. <A HREF="populate.html#POPULATE-ANALYZE" >Run <TT CLASS="COMMAND" >ANALYZE</TT > Afterwards</A ></DT ><DT >14.4.9. <A HREF="populate.html#POPULATE-PG-DUMP" >Some Notes About <SPAN CLASS="APPLICATION" >pg_dump</SPAN ></A ></DT ></DL ></DD ><DT >14.5. <A HREF="non-durability.html" >Non-Durable Settings</A ></DT ></DL ></DIV ><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 ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="locking-indexes.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="using-explain.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Locking and Indexes</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="sql.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Using <TT CLASS="COMMAND" >EXPLAIN</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >