From: David Mitchell <david.mitchell@telogis.com>
To: weigelt@metux.de
Cc: postgresql performance list <pgsql-performance@postgresql.org>
Subject: Re: plain inserts and deletes very slow
Date: Mon, 04 Jul 2005 13:12:55 +1200
Message-ID: <42C88D17.4080004@telogis.com> (raw)
In-Reply-To: <20050704000157.GD9777@nibiru.borg.metux.de>
References: <20050703224537.GA9777@nibiru.borg.metux.de>
<20050703225707.GB9777@nibiru.borg.metux.de>
<42C887DC.40308@telogis.com>
<20050704000157.GD9777@nibiru.borg.metux.de>
Perhaps if you are doing a lot of inserts and deletes, vacuuming every 6
minutes would be closer to your mark. Try vacuuming every 15 minutes for
a start and see how that affects things (you will have to do a vacuum
full to get the tables back into shape after them slowing down as they
have).
David
Enrico Weigelt wrote:
> * David Mitchell <david.mitchell@telogis.com> wrote:
>
>>Did you vacuum full?
>>
>>When you do lots of inserts and deletes, dead tuples get left behind.
>>When you vacuum, postgres will reuse those dead tuples, but if you don't
>>vacuum for a long time these tuples will build up lots. Even when you
>>vacuum in this case, the dead tuples are still there, although they are
>>marked for reuse. Vacuuming full actually removes the dead tuples.
>
>
> I'm doing a VACUUM ANALYZE every 6 hours.
>
> vacuum'ing manually doesnt seem to have any effect on that.
>
>
> cu
--
David Mitchell
Software Engineer
Telogis
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To: pgsql-performance@postgresql.org
Cc: david.mitchell@telogis.com, weigelt@metux.de
Subject: Re: plain inserts and deletes very slow
In-Reply-To: <42C88D17.4080004@telogis.com>
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