I don't have a PostgreSQL build environment.
It is now Friday night for me. I left the alternate query running, and will find out on Monday what happened.
If I drop the fk constraint, and/or its index, would I still be affected by the leak you found?
Regards,
Stephen Denne.
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Fri 25/01/2008 5:50 p.m.
To: Stephen Denne
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] 8.3rc1 Out of memory when performing update
"Stephen Denne" <Stephen.Denne@datamail.co.nz> writes:
> I altered the update statement slightly, and reran the query.
> The altered query has been running over 3 hours now,
> without using lots of memory (38M private bytes).
> 2046 temp files were created (2.54GB worth),
> which have recently changed from slowly growing in size
> to very very slowly reducing in number.
Hmm. I think what that really means is you haven't got to the part of
the query where the leak is :-(. In my attempt to reproduce this
I found that 8.3 has introduced a memory leak into the RI trigger
support, such that even if an UPDATE doesn't change the FK columns
it's still likely to leak a few dozen bytes per updated row.
Please see if the attached patch makes it better for you.
regards, tom lane
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