Message-ID: <48E27D72.9040409@pinpointresearch.com>
Date: Tue, 30 Sep 2008 12:26:42 -0700
From: Steve Crawford <scrawford@pinpointresearch.com>
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To: Carol Walter <walterc@indiana.edu>
CC: pgsql-admin@postgresql.org
Subject: Re: What process clears the logs?
References: <64D96E8A-8E58-458C-B299-8998112F88FA@indiana.edu>
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Carol Walter wrote:
> Greetings,
>
> As you may be aware, we experienced a problem last week with pg_clogs 
> that had been deleted, through human error it appears.  What process 
> will clear or delete the pg_clogs?  I've been all over the 
> documentation and I'm not finding a reference to this.
>
PostgreSQL takes care of this itself. I don't know where it is 
documented but IIRC from old messages, the number of files in pg_xlog 
should level out at about two-times your checkpoint_settings value.

I'd have to do some digging as I don't recall for sure, but I think that 
if you are using archive_command setting to archive WAL files  the 
archive command does not return "success", then the WAL file will not be 
removed/reused.

Cheers,
Steve