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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 >Database Configuration</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="Managing Databases" HREF="managing-databases.html"><LINK REL="PREVIOUS" TITLE="Template Databases" HREF="manage-ag-templatedbs.html"><LINK REL="NEXT" TITLE="Destroying a Database" HREF="manage-ag-dropdb.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="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 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Template Databases" HREF="manage-ag-templatedbs.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="managing-databases.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 21. Managing Databases</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Destroying a Database" HREF="manage-ag-dropdb.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="MANAGE-AG-CONFIG" >21.4. Database Configuration</A ></H1 ><P > Recall from <A HREF="runtime-config.html" >Chapter 18</A > that the <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > server provides a large number of run-time configuration variables. You can set database-specific default values for many of these settings. </P ><P > For example, if for some reason you want to disable the <ACRONYM CLASS="ACRONYM" >GEQO</ACRONYM > optimizer for a given database, you'd ordinarily have to either disable it for all databases or make sure that every connecting client is careful to issue <TT CLASS="LITERAL" >SET geqo TO off</TT >. To make this setting the default within a particular database, you can execute the command: </P><PRE CLASS="PROGRAMLISTING" >ALTER DATABASE mydb SET geqo TO off;</PRE ><P> This will save the setting (but not set it immediately). In subsequent connections to this database it will appear as though <TT CLASS="LITERAL" >SET geqo TO off;</TT > had been executed just before the session started. Note that users can still alter this setting during their sessions; it will only be the default. To undo any such setting, use <TT CLASS="LITERAL" >ALTER DATABASE <TT CLASS="REPLACEABLE" ><I >dbname</I ></TT > RESET <TT CLASS="REPLACEABLE" ><I >varname</I ></TT ></TT >. </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="manage-ag-templatedbs.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="manage-ag-dropdb.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Template Databases</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="managing-databases.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Destroying a Database</TD ></TR ></TABLE ></DIV ></BODY ></HTML >