From: bock@openit.de
To: pgsql-performance@postgresql.org
Subject: Re: long wait times in ProcessCatchupEvent()
Date: Thu, 30 Dec 2010 16:03:53 +0100
Message-ID: <lp8vz7715y.fsf@warpcore.i.openit.de> (raw)
In-Reply-To: <10249.1293635921@sss.pgh.pa.us>
References: <lptyhw1wml.fsf@warpcore.i.openit.de>
<10249.1293635921@sss.pgh.pa.us>
Hi
>>>>> "TL" == Tom Lane <tgl@sss.pgh.pa.us> writes:
TL> bock@openit.de (Julian v. Bock) writes:
>> I have the problem that on our servers it happens regularly under a
>> certain workload (several times per minute) that all backend
>> processes get a SIGUSR1 and spend several seconds in
>> ProcessCatchupEvent().
TL> This is fixed in 8.4 and up.
TL> http://archives.postgresql.org/pgsql-committers/2008-06/msg00227.php
Thanks for the quick reply.
TL> If you aren't willing to move off 8.3 you might be able to
TL> ameliorate the problem by reducing the volume of catalog changes,
TL> but that can be pretty hard if you're dependent on temp tables.
Upgrading to 8.4 or 9.0 is not possible at the moment but if it is only
catalog changes I can probably work around that.
Regards,
Julian v. Bock
--
Julian v. Bock Projektleitung Software-Entwicklung
OpenIT GmbH Tel +49 211 239 577-0
In der Steele 33a-41 Fax +49 211 239 577-10
D-40599 Düsseldorf http://www.openit.de
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To: pgsql-performance@postgresql.org
Cc: bock@openit.de
Subject: Re: long wait times in ProcessCatchupEvent()
In-Reply-To: <lp8vz7715y.fsf@warpcore.i.openit.de>
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