| From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Antoine <melser(dot)anton(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: vacuuming problems continued |
| Date: | 2006-06-05 14:43:49 |
| Message-ID: | 20060605144349.GQ53487@pervasive.com |
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| Lists: | pgsql-performance |
On Thu, Jun 01, 2006 at 11:05:55AM -0400, Tom Lane wrote:
> Antoine <melser(dot)anton(at)gmail(dot)com> writes:
> > We just don't seem to be getting much benefit from autovacuum. Running
> > a manual vacuum seems to still be doing a LOT, which suggests to me
> > that I should either run a cron job and disable autovacuum, or just
> > run a cron job on top of autovacuum.
>
> The default autovac parameters are very unaggressive --- have you
> experimented with changing them? Do you have the FSM set large enough?
Do any of the tables have a high 'churn rate' (a lot of updates) but are
supposed to be small? In cases like that autovacuum may not be enough.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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