Thread: [GENERAL] Deleting unwanted wal files

Hi, if i'm using pg_basebackup utility for taking my database backup and also
enabled wal level archiving, how will i detect the unwanted wal files and
how will it delete them ?



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On Thu, Aug 17, 2017 at 8:06 PM, krish050591 <krish050591@gmail.com> wrote:
> Hi, if i'm using pg_basebackup utility for taking my database backup and also
> enabled wal level archiving, how will i detect the unwanted wal files and
> how will it delete them ?

Have you heard of pg_archivecleanup? Documentation is here:
https://www.postgresql.org/docs/devel/static/pgarchivecleanup.html
If a single archive is not cross-used among multiple standbys, you
could use it with archive_cleanup_command is recovery.conf to remove
unneeded WAL segments.
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Michael

On Fri, Aug 18, 2017 at 12:43 AM, krishna chaitanya
<krish050591@gmail.com> wrote:
> Thanks for your reply,

Please do not top-post, this is not the style of this mailing list.

> but will pg_basebackup generate a .backup file when
> scheduled in cron job so that i can give that as input to pg_archivecleanup.

Yes.

> Also if i give archive_cleanup_command in recovery.conf will it check the
> presence of recovery.conf file automatically and execute the command from
> that file ?

You can feed a backup history file name to pg_archivecleanup, it will
then reuse the prefix of this file name. archive_cleanup_command is
part of recovery.conf, which gets loaded by the server at the
beginning of recovery by the startup process, so the command will get
executed continuously on a standby.
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Michael