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From: Adriaan van Os <postgres@microbizz.nl>
To: pgsql-performance@postgresql.org
Subject: Re: TRUNCATE TABLE
Date: Sat, 04 Aug 2007 23:39:31 +0200
Message-ID: <46B4F213.3000203@microbizz.nl> (raw)
In-Reply-To: <46B050B8.EE98.0025.0@wicourts.gov>
References: <46953949.3030201@microbizz.nl>
	<87ps2ypox3.fsf@oxford.xeocode.com>
	<46972DFA.9000900@microbizz.nl>
	<20070713124435.GL31358@mathom.us>
	<21495.1184337630@sss.pgh.pa.us>
	<4697A58E.8060904@microbizz.nl>
	<23092.1184344246@sss.pgh.pa.us>
	<20070713173501.GD12109@alvh.no-ip.org>
	<162867790707131212g17cbc5a9q5d098dbf01c8e502@mail.gmail.com>
	<20070716213944.GA39272@nasby.net>
	<20070716213944.GA39272@nasby.net>
	<25418.1184631498@sss.pgh.pa.us>
	<46B050B8.EE98.0025.0@wicourts.gov>

Kevin Grittner wrote:
>>>> On Mon, Jul 16, 2007 at  7:18 PM, in message <25418.1184631498@sss.pgh.pa.us>,
> Tom Lane <tgl@sss.pgh.pa.us> wrote: 
>> Somehow, autovac is doing something that makes the filesystem go nuts
>> every so often, and take an astonishingly long time to create an empty
>> file.  But autovac itself doesn't create or delete any files, so what's
>> up here?
>  
> Have you ruled out checkpoints as the culprit?

That's a good question. I will do some more tests, but I also suspect fsync "cascading"
<http://www.uwsg.iu.edu/hypermail/linux/kernel/0708.0/1435.html;.

Regards,

Adriaan van Os




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