Re: best way to run maintenance script

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On Fri, 14 Mar 2008 17:00:21 -0800
Vinubalaji Gopal <vgopal(at)abaca(dot)com> wrote:

> Hi all,
> I have been searching for the best way to run maintenance scripts
> which does a vacuum, analyze and deletes some old data. Whenever the
> maintenance script runs - mainly the pg_maintenance --analyze script -
> it slows down postgresql inserts and I want to avoid that. The system
> is under constant load and I am not interested in the time taken to
> vacuum. Is there a utility or mechanism in postgresql which helps in
> reducing priority of maintenance queries?

You can use parameters such as vacuum_cost_delay to help this... see
the docs:

http://www.postgresql.org/docs/8.3/static/runtime-config-autovacuum.html

>
> Is writing a postgresql C function and setting the priority of process
> the only way to change the priority of the maintenance script or is
> there a better way.
> http://weblog.bignerdranch.com/?p=11
>
> I tried using the nice command (Linux system) on the maintenance
> script
> - it did not have any effect - guess it does not change the niceness
> of the postgresql vacuum process.
>
> (I am running Postgresql 8.0 on a Linux)

If you are truly running 8.0 and not something like 8.0.15 vacuum is
the least of your worries.

Sincerely,

Joshua D. Drake

- --
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