Hi Dick,
On Wed, Aug 19, 2009 at 09:23:22PM +0200, Dick Visser wrote:
> A bit of a long first story, hope someone is able to help...
>
> We have got a Ubuntu 8.04 server running Postfix, which reads its
> mailing list subscription files, aliases, virtual, domains, etc from a
> Postgres database.
>
> This used to work fine when we had only a couple of e-mail distribution
> lists. However, recently a lot of new lists have been added and the
> system becomes very slow.
>
> Turns out there a couple of very complicated views using other views,
> using concatenated strings etc. A SELECT on this view takes about 2.5
> seconds. Tuning the resource allocation brought it down to 1.2 seconds.
> We have looked at the queries and came to the conclusion that it would
> not be feasible to bring this down any further.
Are you sure you have finished tuning at the database level - indices,
partitions etc.? What does EXPLAIN ANALYZE of a typical slow query show?
BTW: Which version of PG are you running?
Tino.
--
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