Re: simple join uses indexes, very slow

> -----Original Message-----
> From: pgsql-performance-owner(at)postgresql(dot)org
[mailto:pgsql-performance-
> owner(at)postgresql(dot)org] On Behalf Of george young
> Sent: Monday, March 27, 2006 12:48 PM
> To: pgsql-performance(at)postgresql(dot)org
> Subject: [PERFORM] simple join uses indexes, very slow
>
[Snip]
>
> Indexes:
> "parameters_idx" btree (run, opset_num, step_num, opset,
opset_ver,
> step, step_ver, name, split, wafers)
> "parameters_opset_idx" btree (opset, step, name)
> "parameters_step_idx" btree (step, name)
>

Have you tried creating some different indexes on parameters? I don't
know if it should matter or not, but I would try some indexes like:

(run, opset_num) //Without all the other columns
(opset_num, run) //Backwards
(opset_num)

I don't really know Postgres internals all that well. It just seems to
me that parameters_idx has a lot of columns this query is not interested
in. I'd just be curious to see what happens.