From: Steve Crawford <scrawford@pinpointresearch.com>
To: Carol Walter <walterc@indiana.edu>
Cc: pgsql-admin@postgresql.org
Subject: Re: What process clears the logs?
Date: Tue, 30 Sep 2008 14:58:36 -0700
Message-ID: <48E2A10C.9060602@pinpointresearch.com> (raw)
In-Reply-To: <ED139E0C-2CA8-4761-81D5-CFE6FD1A7E7F@indiana.edu>
References: <64D96E8A-8E58-458C-B299-8998112F88FA@indiana.edu>
<48E27D72.9040409@pinpointresearch.com>
<ED139E0C-2CA8-4761-81D5-CFE6FD1A7E7F@indiana.edu>
Carol Walter wrote:
> Ah-h-h, that's exactly my question. What part of Postgres "takes care
> of this itself." I'm asking because I had 86 pg_clog files dated back
> to mid-May. I got the impression from something Tom said that backups
> should prune this directory. Perhaps my "impression" was wrong. Most
> databases I've used in the past have gotten rid of the transaction
> logs, etc, when a backup is done. The restore process used that last
> backup and then applied the transaction logs to it. Once another
> backup was completed the old transaction logs were no longer needed.
> I'm trying to understand what happens "under the hood" so to speak.
> What checkpoint_settings value are you referring to?
Sorry. I had a brain/fingers disconnect. I meant the
"checkpoint_segments" setting. Anyway, answers to a number of your
questions regarding write-ahead logging may be found here:
http://www.postgresql.org/docs/8.3/interactive/wal-configuration.html
Cheers,
Steve
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To: pgsql-admin@postgresql.org
Cc: scrawford@pinpointresearch.com, walterc@indiana.edu
Subject: Re: What process clears the logs?
In-Reply-To: <48E2A10C.9060602@pinpointresearch.com>
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