From: | Khusro Jaleel <mailing-lists(at)kerneljack(dot)com> |
---|---|
To: | pgsql-admin(at)postgresql(dot)org |
Subject: | Backing up a replication set every 30 mins |
Date: | 2012-02-15 12:42:14 |
Message-ID: | 4F3BA826.9000708@kerneljack.com |
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Lists: | pgsql-admin |
Hi,
I have setup replication on Postgresql 9.1 in a simple scenario using a
master and a slave. I now need a reliable way (and preferably fast way)
to do backups of the database.
I tried using 'archive_command' on the master and created a script that
simply bzips files and copies them to a directory, but after 1 day that
directory was so huge that even a simple 'rm' complained that the
'argument list is too long'.
I can see that even though I have specified 30 minutes in the
postgresql.conf, a new archive file is written every *minute* resulting
in way too many files in the archive directory. This happens even when
*nobody* is using the DB, or with just very light use. However I have
noticed that sometimes this *does* work correctly and an archive is only
written out every 30 mins.
Is there a way to force this to just write to the archive directory
*only* every 30 mins as I only really need backups to be current to the
last 30 mins or so?
===============
checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
checkpoint_timeout = 30min # range 30s-1h
archive_timeout = 30 # force a logfile segment switch after this
wal_keep_segments = 14375
===============
If this is NOT the right way to backup the database, then can you please
suggest an alternative method? I could write a script that calls
'pg_start_backup' and 'pg_stop_backup' with an rsync in between to a
backup server and run it every 30 mins. I am thinking that this would
work, even if people are busy using the DB (reads/writes)?
I want to avoid using pg_dump as I think that would require I pause
writes to the DB until the backup is finished?
Any help appreciated, thanks,
Khusro
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