| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Łukasz Jagiełło <lukasz(dot)jagiello(at)gforces(dot)pl>, Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Problems with autovacuum |
| Date: | 2009-05-26 18:19:34 |
| Message-ID: | 20090526181934.GG32650@alvh.no-ip.org |
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| Lists: | pgsql-performance |
Tom Lane escribió:
> =?UTF-8?B?xYF1a2FzeiBKYWdpZcWCxYJv?= <lukasz(dot)jagiello(at)gforces(dot)pl> writes:
> > That autovacuum working hole time, shoudn't be run only when db needs ?
>
> With 2000 databases to cycle through, autovac is going to be spending
> quite a lot of time just finding out whether it needs to do anything.
> I believe the interpretation of autovacuum_naptime is that it should
> examine each database that often, ie once a minute by default. So
> it's got more than 30 databases per second to look through.
Note that this is correct in 8.1 and 8.2 but not 8.3 onwards.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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