| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| To: | Crash Dummy <crash(dot)dummy(at)ntlworld(dot)com> |
| Cc: | <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Query planner problem |
| Date: | 2002-03-13 18:28:15 |
| Message-ID: | 20020313102716.D84314-100000@megazone23.bigpanda.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On Sat, 9 Mar 2002, Crash Dummy wrote:
> Hi,
>
> I've moved a database onto a much faster machine but for some reason the
> query planner is opting to use seq scan methods rather than the indexes.
>
> This is a very large database without the indexes the performance is dire -
> the new machine is a 2Ghz P4 with 1GB RAM, the old machine is a 900Mhz P3
> with 512Mb Ram.
>
> Any idea why this is happening adn what I can do to solve the problem ? I've
> tried dropping & rebuilding the indexes, vacuum analyze etc but to no
> effect.
What do the schema and queries look like, and what does explain (explain
analyze if you've got 7.2) show for them?
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