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Re: 8.3 Autovacuum Questions

From: "Chris Hoover" <revoohc(at)gmail(dot)com>
To: "Alvaro Herrera" <alvherre(at)commandprompt(dot)com>
Cc: "pgsql-admin(at)postgresql(dot)org Admin" <pgsql-admin(at)postgresql(dot)org>
Subject: Re: 8.3 Autovacuum Questions
Date: 2008-07-14 20:34:41
Message-ID: 1d219a6f0807141334s2ca9b2fu1939f6ab80310f51@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-admin
On Mon, Jul 14, 2008 at 4:29 PM, Alvaro Herrera <alvherre(at)commandprompt(dot)com>
wrote:

> Chris Hoover escribió:
> > I just have a couple of quick questions about 8.3 and Autovacuum.
> >
> > 1.  When autovacuum chooses to vacuum a table, the entire table is
> vacuumed,
> > and not just a specified percentage of the table.  Correct?
>
> Yes.
>
> > 2.  There is no way, without turning autovacuum off, of excluding
> > vacuum/analyze during a specific period of time (say during a known peak
> > usage period).
>
> Nope, no way.  (You could have a script to update the
> pg_autovacuum.enabled flag, and change it using cron.)
>
> > 3.  If I have a PostgreSQL cluster with 10 databases, does
> > autovacuum_max_workers=3 mean I have a possibility of 3 total workers or
> 30
> > workers (i.e. autovacuum_max_workers * number of db's)?
>
> 3 workers total.
>
> --
> Alvaro Herrera
> http://www.CommandPrompt.com/
> The PostgreSQL Company - Command Prompt, Inc.
>

Alvaro,

Thanks a bunch for the concise answers.  That is exactly what we needed to
confirm.

Chris

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Subject: More Autovacuum questions
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