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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 >Reliability and the Write-Ahead Log</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="Server Administration" HREF="admin.html"><LINK REL="PREVIOUS" TITLE="Disk Full Failure" HREF="disk-full.html"><LINK REL="NEXT" TITLE="Reliability" HREF="wal-reliability.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="Disk Full Failure" HREF="disk-full.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="admin.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Reliability" HREF="wal-reliability.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="WAL" ></A >Chapter 29. Reliability and the Write-Ahead Log</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT >29.1. <A HREF="wal-reliability.html" >Reliability</A ></DT ><DT >29.2. <A HREF="wal-intro.html" >Write-Ahead Logging (<ACRONYM CLASS="ACRONYM" >WAL</ACRONYM >)</A ></DT ><DT >29.3. <A HREF="wal-async-commit.html" >Asynchronous Commit</A ></DT ><DT >29.4. <A HREF="wal-configuration.html" ><ACRONYM CLASS="ACRONYM" >WAL</ACRONYM > Configuration</A ></DT ><DT >29.5. <A HREF="wal-internals.html" >WAL Internals</A ></DT ></DL ></DIV ><P > This chapter explains how the Write-Ahead Log is used to obtain efficient, reliable operation. </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="disk-full.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="wal-reliability.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Disk Full Failure</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="admin.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Reliability</TD ></TR ></TABLE ></DIV ></BODY ></HTML >