On Wed, 23 Apr 2008 16:27:33 +0100
John Gardner <john.gardner@tagish.co.uk> wrote:
> We have two PostgreSQL servers (8.2) running in a cluster.
Could you be a bit more specific about what you mean by: in a cluster?
> Now, we're not seeing any problems with performance and we're not
> seeing any bloat but I have a couple of questions which I hope some
> of you can help me out on.
>
> 1) Is using the autovacuum daemon and running vacuumdb from a cron
> job overkill?
Not necessarily. Autovacuum can get behind when managing larger tables
that are actively used. This is better in 8.3 because you can have more
than one autovacuum worker.
>
> 2) The vendor of the clustering software suggests that I regularly
> run vacuum --all --analyze on a specific table. Surely, if I'm
> running vacuumdb --all --analyze isn't this just a wrapper for
> running the vacuum --all --analyze command anyway?
Well you have stated two different things here.
1. The vendor is stating you should vacuum a specific table
2. You are vacuuming the whole database.
Do you have a specific table that they are talking about? Is it
particularly busy? Say a session table?
> I guess that I'm
> asking why would I want to run vacuum --all --analyze on a specific
> table, when I regularly run vacuumdb --all --analyze on all databases?
>
Yes those two are identical.
Joshua D. Drake
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