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'\" t .\" Title: pg_walsummary .\" 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_WALSUMMARY" "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_walsummary \- print contents of WAL summary files .SH "SYNOPSIS" .HP \w'\fBpg_walsummary\fR\ 'u \fBpg_walsummary\fR [\fIoption\fR...] [\fIfile\fR...] .SH "DESCRIPTION" .PP pg_walsummary is used to print the contents of WAL summary files\&. These binary files are found in the pg_wal/summaries subdirectory of the data directory, and can be converted to text using this tool\&. This is not ordinarily necessary, since WAL summary files primarily exist to support incremental backup, but it may be useful for debugging purposes\&. .PP A WAL summary file is indexed by tablespace OID, relation OID, and relation fork\&. For each relation fork, it stores the list of blocks that were modified by WAL within the range summarized in the file\&. It can also store a "limit block," which is 0 if the relation fork was created or truncated within the relevant WAL range, and otherwise the shortest length to which the relation fork was truncated\&. If the relation fork was not created, deleted, or truncated within the relevant WAL range, the limit block is undefined or infinite and will not be printed by this tool\&. .SH "OPTIONS" .PP .PP \fB\-i\fR .br \fB\-\-individual\fR .RS 4 By default, pg_walsummary prints one line of output for each range of one or more consecutive modified blocks\&. This can make the output a lot briefer, since a relation where all blocks from 0 through 999 were modified will produce only one line of output rather than 1000 separate lines\&. This option requests a separate line of output for every modified block\&. .RE .PP \fB\-q\fR .br \fB\-\-quiet\fR .RS 4 Do not print any output, except for errors\&. This can be useful when you want to know whether a WAL summary file can be successfully parsed but don\*(Aqt care about the contents\&. .RE .PP \fB\-V\fR .br \fB\-\-version\fR .RS 4 Display version information, then exit\&. .RE .PP \fB\-?\fR .br \fB\-\-help\fR .RS 4 Shows help about pg_walsummary command line arguments, and exits\&. .RE .SH "ENVIRONMENT" .PP The environment variable \fBPG_COLOR\fR specifies whether to use color in diagnostic messages\&. Possible values are always, auto and never\&. .SH "SEE ALSO" \fBpg_basebackup\fR(1), \fBpg_combinebackup\fR(1)