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Re: Problems with autovacuum

From: Łukasz Jagiełło <lukasz(dot)jagiello(at)gforces(dot)pl>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: 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: 2009-05-25 19:07:53
Message-ID: de899fb00905251207j35ac664er116074db42ba26d@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
2009/5/25 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> 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.
>
> Maybe it would make more sense to have one database (or at least,
> many fewer databases) and 2000 schemas within it?

It's rather impossible in my case.

> If you really want to stick with this layout, you're going to have to
> increase autovacuum_naptime.

Thanks for hint.

-- 
Łukasz Jagiełło
System Administrator
G-Forces Web Management Polska sp. z o.o. (www.gforces.pl)

Ul. Kruczkowskiego 12, 80-288 Gdańsk
Spółka wpisana do KRS pod nr 246596 decyzją Sądu Rejonowego Gdańsk-Północ

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