Re: [PERFORM] DELETE taking too much memory

From: Vincent de Phily <vincent(dot)dephily(at)mobile-devices(dot)fr>
To: "French, Martin" <frenchm(at)cromwell(dot)co(dot)uk>
Cc: pgsql-general(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] DELETE taking too much memory
Date: 2011-07-08 09:50:16
Message-ID: 2882675.kL2jiuFQz7@moltowork
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On Friday 08 July 2011 10:31:33 French, Martin wrote:
> If the query planner thinks it has the default amount of memory (128MB)
> and the stats are out of date, then it will by no means be able to plan
> proper execution.
>
> I would recommend setting the effective_cache_size to an appropriate
> value, running "analyze" on both tables with an appropriate stats
> target, and then explaining the query again to see if it's more
> accurate.

Yes, I'll schedule those two to run during the night and repost an explain,
for information. However, we worked around the initial problem by running the
delete in smaller batches.

Thanks.
--
Vincent de Phily

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