From: | "Christopher Kings-Lynne" <chriskl(at)familyhealth(dot)com(dot)au> |
---|---|
To: | "Michael Guerin" <guerin(at)rentec(dot)com>, <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Simple queries take forever to run |
Date: | 2003-08-28 01:29:01 |
Message-ID: | 010101c36d03$c2dae240$2800a8c0@mars |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
> postgresql version 7.3.3
> .conf params changed from defaults.
> shared_buffers = 64000
> sort_mem = 64000
> fsync = false
> effective_cache_size = 400000
>
> ex. query: select * from x where id in (select id from y);
>
> There's an index on each table for id. SQL Server takes <1s to return,
> postgresql doesn't return at all, neither does explain analyze.
> x has 1200673 rows
> y has 1282 rows
>
> It seems like its ignoring the index and not using enough memory.. any
> ideas?
This is a known problem in 7.3, it is much faster in 7.4b1. This should be
very, very fast though, and do exactly the same thing:
select * from x where exists (select id from y where y.id=x.id);
Chris
From | Date | Subject | |
---|---|---|---|
Next Message | Christopher Browne | 2003-08-28 01:32:16 | Re: Hardware recommendations to scale to silly load |
Previous Message | Stephan Szabo | 2003-08-28 01:22:23 | Re: Simple queries take forever to run |