From: Alvaro Herrera <alvherre@commandprompt.com>
To: Chris Hoover <revoohc@gmail.com>
Cc: pgsql-admin@postgresql.org Admin <pgsql-admin@postgresql.org>
Subject: Re: 8.3 Autovacuum Questions
Date: Mon, 14 Jul 2008 16:29:33 -0400
Message-ID: <20080714202933.GK4050@alvh.no-ip.org> (raw)
In-Reply-To: <1d219a6f0807141326p16d86505o84642b8d49fa6ad8@mail.gmail.com>
References: <1d219a6f0807141326p16d86505o84642b8d49fa6ad8@mail.gmail.com>
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.
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To: pgsql-admin@postgresql.org
Cc: alvherre@commandprompt.com, revoohc@gmail.com
Subject: Re: 8.3 Autovacuum Questions
In-Reply-To: <20080714202933.GK4050@alvh.no-ip.org>
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