From: Chris Hoover <revoohc@gmail.com>
To: Alvaro Herrera <alvherre@commandprompt.com>
Cc: pgsql-admin@postgresql.org Admin <pgsql-admin@postgresql.org>
Subject: Re: 8.3 Autovacuum Questions
Date: Mon, 14 Jul 2008 16:34:41 -0400
Message-ID: <1d219a6f0807141334s2ca9b2fu1939f6ab80310f51@mail.gmail.com> (raw)
In-Reply-To: <20080714202933.GK4050@alvh.no-ip.org>
References: <1d219a6f0807141326p16d86505o84642b8d49fa6ad8@mail.gmail.com>
<20080714202933.GK4050@alvh.no-ip.org>
On Mon, Jul 14, 2008 at 4:29 PM, Alvaro Herrera <alvherre@commandprompt.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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-admin@postgresql.org
Cc: revoohc@gmail.com, alvherre@commandprompt.com
Subject: Re: 8.3 Autovacuum Questions
In-Reply-To: <1d219a6f0807141334s2ca9b2fu1939f6ab80310f51@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox