path: root/doc/src/sgml/man1/pg_archivecleanup.1

'\" t
.\"     Title: pg_archivecleanup
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 2024
.\"    Manual: PostgreSQL 16.2 Documentation
.\"    Source: PostgreSQL 16.2
.\"  Language: English
.\"
.TH "PG_ARCHIVECLEANUP" "1" "2024" "PostgreSQL 16.2" "PostgreSQL 16.2 Documentation"
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.SH "NAME"
pg_archivecleanup \- clean up PostgreSQL WAL archive files
.SH "SYNOPSIS"
.HP \w'\fBpg_archivecleanup\fR\ 'u
\fBpg_archivecleanup\fR [\fIoption\fR...] \fIarchivelocation\fR \fIoldestkeptwalfile\fR
.SH "DESCRIPTION"
.PP
pg_archivecleanup
is designed to be used as an
archive_cleanup_command
to clean up WAL file archives when running as a standby server (see
Section\ \&27.2)\&.
pg_archivecleanup
can also be used as a standalone program to clean WAL file archives\&.
.PP
To configure a standby server to use
pg_archivecleanup, put this into its
postgresql\&.conf
configuration file:
.sp
.if n \{\
.RS 4
.\}
.nf
archive_cleanup_command = \*(Aqpg_archivecleanup \fIarchivelocation\fR %r\*(Aq
.fi
.if n \{\
.RE
.\}
.sp
where
\fIarchivelocation\fR
is the directory from which WAL segment files should be removed\&.
.PP
When used within
archive_cleanup_command, all WAL files logically preceding the value of the
%r
argument will be removed from
\fIarchivelocation\fR\&. This minimizes the number of files that need to be retained, while preserving crash\-restart capability\&. Use of this parameter is appropriate if the
\fIarchivelocation\fR
is a transient staging area for this particular standby server, but
\fInot\fR
when the
\fIarchivelocation\fR
is intended as a long\-term WAL archive area, or when multiple standby servers are recovering from the same archive location\&.
.PP
When used as a standalone program all WAL files logically preceding the
\fIoldestkeptwalfile\fR
will be removed from
\fIarchivelocation\fR\&. In this mode, if you specify a
\&.partial
or
\&.backup
file name, then only the file prefix will be used as the
\fIoldestkeptwalfile\fR\&. This treatment of
\&.backup
file name allows you to remove all WAL files archived prior to a specific base backup without error\&. For example, the following example will remove all files older than WAL file name
000000010000003700000010:
.sp
.if n \{\
.RS 4
.\}
.nf
pg_archivecleanup \-d archive 000000010000003700000010\&.00000020\&.backup

pg_archivecleanup:  keep WAL file "archive/000000010000003700000010" and later
pg_archivecleanup:  removing file "archive/00000001000000370000000F"
pg_archivecleanup:  removing file "archive/00000001000000370000000E"
.fi
.if n \{\
.RE
.\}
.PP
pg_archivecleanup
assumes that
\fIarchivelocation\fR
is a directory readable and writable by the server\-owning user\&.
.SH "OPTIONS"
.PP
pg_archivecleanup
accepts the following command\-line arguments:
.PP
\fB\-d\fR
.RS 4
Print lots of debug logging output on
stderr\&.
.RE
.PP
\fB\-n\fR
.RS 4
Print the names of the files that would have been removed on
stdout
(performs a dry run)\&.
.RE
.PP
\fB\-V\fR
.br
\fB\-\-version\fR
.RS 4
Print the
pg_archivecleanup
version and exit\&.
.RE
.PP
\fB\-x\fR \fIextension\fR
.RS 4
Provide an extension that will be stripped from all file names before deciding if they should be deleted\&. This is typically useful for cleaning up archives that have been compressed during storage, and therefore have had an extension added by the compression program\&. For example:
\-x \&.gz\&.
.RE
.PP
\fB\-?\fR
.br
\fB\-\-help\fR
.RS 4
Show help about
pg_archivecleanup
command line arguments, and exit\&.
.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 "NOTES"
.PP
pg_archivecleanup
is designed to work with
PostgreSQL
8\&.0 and later when used as a standalone utility, or with
PostgreSQL
9\&.0 and later when used as an archive cleanup command\&.
.PP
pg_archivecleanup
is written in C and has an easy\-to\-modify source code, with specifically designated sections to modify for your own needs
.SH "EXAMPLES"
.PP
On Linux or Unix systems, you might use:
.sp
.if n \{\
.RS 4
.\}
.nf
archive_cleanup_command = \*(Aqpg_archivecleanup \-d /mnt/standby/archive %r 2>>cleanup\&.log\*(Aq
.fi
.if n \{\
.RE
.\}
.sp
where the archive directory is physically located on the standby server, so that the
\fIarchive_command\fR
is accessing it across NFS, but the files are local to the standby\&. This will:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
produce debugging output in
cleanup\&.log
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
remove no\-longer\-needed files from the archive directory
.RE