<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Extensions</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 9.3.9 Documentation" HREF="index.html"><LINK REL="UP" TITLE="External Projects" HREF="external-projects.html"><LINK REL="PREVIOUS" TITLE="Procedural Languages" HREF="external-pl.html"><LINK REL="NEXT" TITLE="The Source Code Repository" HREF="sourcerepo.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="2015-06-13T20:07:22"></HEAD ><BODY CLASS="SECT1" ><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 9.3.9 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Procedural Languages" HREF="external-pl.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="external-projects.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Appendix H. External Projects</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="The Source Code Repository" HREF="sourcerepo.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="EXTERNAL-EXTENSIONS" >H.4. Extensions</A ></H1 ><P > <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > is designed to be easily extensible. For this reason, extensions loaded into the database can function just like features that are built in. The <TT CLASS="FILENAME" >contrib/</TT > directory shipped with the source code contains several extensions, which are described in <A HREF="contrib.html" >Appendix F</A >. Other extensions are developed independently, like <SPAN CLASS="APPLICATION" ><A HREF="http://www.postgis.org/" TARGET="_top" >PostGIS</A ></SPAN >. Even <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > replication solutions can be developed externally. For example, <SPAN CLASS="APPLICATION" > <A HREF="http://www.slony.info" TARGET="_top" >Slony-I</A ></SPAN > is a popular master/standby replication solution that is developed independently from the core project. </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="external-pl.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="sourcerepo.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Procedural Languages</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="external-projects.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >The Source Code Repository</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
