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 |
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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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