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'\" t .\" Title: pg_controldata .\" Author: The PostgreSQL Global Development Group .\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> .\" Date: 2026 .\" Manual: PostgreSQL 17.10 Documentation .\" Source: PostgreSQL 17.10 .\" Language: English .\" .TH "PG_CONTROLDATA" "1" "2026" "PostgreSQL 17.10" "PostgreSQL 17.10 Documentation" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" pg_controldata \- display control information of a PostgreSQL database cluster .SH "SYNOPSIS" .HP \w'\fBpg_controldata\fR\ 'u \fBpg_controldata\fR [\fIoption\fR] [[\fB\-D\fR | \fB\-\-pgdata\fR]\fIdatadir\fR] .SH "DESCRIPTION" .PP \fBpg_controldata\fR prints information initialized during \fBinitdb\fR, 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\&. .PP 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 \fBPGDATA\fR\&. This utility supports the options \fB\-V\fR and \fB\-\-version\fR, which print the pg_controldata version and exit\&. It also supports options \fB\-?\fR and \fB\-\-help\fR, which output the supported arguments\&. .SH "ENVIRONMENT" .PP \fBPGDATA\fR .RS 4 Default data directory location .RE .PP \fBPG_COLOR\fR .RS 4 Specifies whether to use color in diagnostic messages\&. Possible values are always, auto and never\&. .RE