<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pg_controldata</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 8.0.11 Documentation" HREF="index.html"><LINK REL="UP" TITLE="PostgreSQL Server Applications" HREF="reference-server.html"><LINK REL="PREVIOUS" TITLE="ipcclean" HREF="app-ipcclean.html"><LINK REL="NEXT" TITLE="pg_ctl" HREF="app-pg-ctl.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="2007-02-02T03:57:22"></HEAD ><BODY CLASS="REFENTRY" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" >PostgreSQL 8.0.11 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="app-ipcclean.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="app-ipcclean.html" >Fast Backward</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="app-pg-ctl.html" >Fast Forward</A ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="app-pg-ctl.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="APP-PGCONTROLDATA" ></A ><SPAN CLASS="APPLICATION" >pg_controldata</SPAN ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN50489" ></A ><H2 >Name</H2 >pg_controldata -- display control information of a <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > database cluster</DIV ><A NAME="AEN50493" ></A ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN50495" ></A ><H2 >Synopsis</H2 ><P ><TT CLASS="COMMAND" >pg_controldata</TT > [<TT CLASS="REPLACEABLE" ><I >datadir</I ></TT >]</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="R1-APP-PGCONTROLDATA-1" ></A ><H2 >Description</H2 ><P > <TT CLASS="COMMAND" >pg_controldata</TT > prints information initialized during <TT CLASS="COMMAND" >initdb</TT >, such as the catalog version and server locale. It also shows information about write-ahead logging and checkpoint processing. This information is cluster-wide, and not specific to any one database. </P ><P > This utility may only be run by the user who initialized the cluster because it requires read access to the data directory. You can specify the data directory on the command line, or use the environment variable <TT CLASS="ENVAR" >PGDATA</TT >. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN50507" ></A ><H2 >Environment</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="ENVAR" >PGDATA</TT ></DT ><DD ><P > Default data directory location </P ></DD ></DL ></DIV ></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="app-ipcclean.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="app-pg-ctl.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="APPLICATION" >ipcclean</SPAN ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="reference-server.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><SPAN CLASS="APPLICATION" >pg_ctl</SPAN ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >