From: Andrew Dunstan <andrew@dunslane.net>
To: ktm@rice.edu <ktm@rice.edu>
To: Joshua D. Drake <jd@commandprompt.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Jan Gunnar Dyrset <jan.g.dyrset@cybernetica.no>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: PostgreSQL disk fragmentation causes performance problems on Windows
Date: Wed, 29 Apr 2015 10:56:12 -0400
Message-ID: <5540F10C.9030400@dunslane.net> (raw)
In-Reply-To: <20150429143543.GQ3510@aart.rice.edu>
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<20150429143543.GQ3510@aart.rice.edu>
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On 04/29/2015 10:35 AM, ktm@rice.edu wrote:
> On Wed, Apr 29, 2015 at 07:07:04AM -0700, Joshua D. Drake wrote:
>> On 04/29/2015 01:08 AM, Andres Freund wrote:
>>
>>>> Which OS and filesystem is this done on? Because many halfway modern
>>>> systems, like e.g ext4 and xfs, implement this in the background as
>>>> 'delayed allocation'.
>>> Oh, it's in the subject. Stupid me, sorry for that. I'd consider testing
>>> how much better this behaves under a different operating system, as a
>>> shorter term relief.
>> This is a known issue on the Windows platform. It is part of the
>> limitations of that environment. Linux/Solaris/FreeBSD do not suffer
>> from this issue in nearly the same manner.
>>
>> jD
>>
> You might consider a CLUSTER or VACUUM FULL to re-write the table with
> less fragmentation.
>
Or pg_repack if you can't handle the lockup time that these involve.
cheers
andrew
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To: pgsql-performance@postgresql.org
Cc: andrew@dunslane.net, ktm@rice.edu, jd@commandprompt.com, andres@anarazel.de, jan.g.dyrset@cybernetica.no
Subject: Re: PostgreSQL disk fragmentation causes performance problems on Windows
In-Reply-To: <5540F10C.9030400@dunslane.net>
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