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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 >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 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="PostgreSQL Server Applications" HREF="reference-server.html"><LINK REL="PREVIOUS" TITLE="initdb" HREF="app-initdb.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="2017-11-06T22:43:11"></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" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="initdb" HREF="app-initdb.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="reference-server.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="pg_ctl" 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="AEN86899" ></A ><H2 >Name</H2 >pg_controldata -- display control information of a <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > database cluster</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN86905" ></A ><H2 >Synopsis</H2 ><P ><TT CLASS="COMMAND" >pg_controldata</TT > [<TT CLASS="REPLACEABLE" ><I >option</I ></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. 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 can 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 >. This utility supports the options <TT CLASS="OPTION" >-V</TT > and <TT CLASS="OPTION" >--version</TT >, which print the <SPAN CLASS="APPLICATION" >pg_controldata</SPAN > version and exit. It also supports options <TT CLASS="OPTION" >-?</TT > and <TT CLASS="OPTION" >--help</TT >, which output the supported arguments. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN86924" ></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-initdb.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" >initdb</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 >