| From: | "ktm(at)rice(dot)edu" <ktm(at)rice(dot)edu> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Jan Gunnar Dyrset <jan(dot)g(dot)dyrset(at)cybernetica(dot)no>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: PostgreSQL disk fragmentation causes performance problems on Windows |
| Date: | 2015-04-29 14:35:43 |
| Message-ID: | 20150429143543.GQ3510@aart.rice.edu |
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| Thread: | |
| Lists: | pgsql-performance |
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.
Regards,
Ken
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