From: Tom Lane <tgl@sss.pgh.pa.us>
To: vegard.bones@met.no
Cc: pgsql-performance@postgresql.org
Subject: Re: Deteriorating performance when loading large objects
Date: Tue, 25 Nov 2008 08:36:46 -0500
Message-ID: <14976.1227620206@sss.pgh.pa.us> (raw)
In-Reply-To: <63696.85.166.86.82.1227617663.squirrel@webmailsunny.oslo.dnmi.no>
References: <63696.85.166.86.82.1227617663.squirrel@webmailsunny.oslo.dnmi.no>
"=?iso-8859-1?Q?Vegard_B=F8nes?=" <vegard.bones@met.no> writes:
> I have a problem with large objects in postgresql 8.1: The performance of
> loading large objects into a database goes way down after a few days of
> operation.
> I have a cron job kicking in twice a day, which generates and loads around
> 6000 large objects of 3.7MB each. Each night, old data is deleted, so
> there is never more than 24000 large object in the database.
Are you sure you're deleting the large objects themselves (ie,
lo_unlink), and not just deleting some references to them?
A manual "vacuum verbose" on pg_largeobject might be informative.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, vegard.bones@met.no
Subject: Re: Deteriorating performance when loading large objects
In-Reply-To: <14976.1227620206@sss.pgh.pa.us>
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