| From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
|---|---|
| To: | Gourish Singbal <gourish(at)gmail(dot)com> |
| Cc: | "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org> |
| Subject: | Re: Autovacuuming |
| Date: | 2006-04-24 17:51:15 |
| Message-ID: | 20060424175115.GF48010@pervasive.com |
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| Lists: | pgsql-admin |
On Mon, Apr 24, 2006 at 11:21:16AM +0530, Gourish Singbal wrote:
> The Age of the database is 1144759836 . We have enabled autovacuuming .
> The details are:-
> autovacuum = on
> autovacuum_naptime = 300
> autovacuum_vacuum_threshold = 10000
> autovacuum_analyze_threshold = 5000
> autovacuum_vacuum_scale_factor = 0.3
> autovacuum_analyze_scale_factor = 0.3
Those settings are *really* conservative... I normally use 400, 200,
0.2, 0.1 respectively...
> Wanted to know when the auto-vacuum daemon will run an database-wide vacuum
> call to avoid transaction ID wraparound failures.
IIRC it will do that somewhere between 2B and 4B transactions have
elapsed. The true answer lies somewhere in
src/backend/postmaster/autovacuum.c.
--
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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