Re: 8.3 Autovacuum Questions

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