Re: QRY seems not using indexes

From: "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: QRY seems not using indexes
Date: 2005-08-09 04:30:41
Message-ID: dd9bm4$238b$1@news.hub.org
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-performance


<morandell(at)gmail(dot)com> writes
>
>
> so, if I do a qry like "EXPLAIN ANALYZE select * from pridecdr where
> idsede=8977758488" it tooks a lot of time before i get back any result:
>
> Index Scan using prd_id_sede on pridecdr (cost=0.00..699079.90
> rows=181850 width=138) (actual time=51.241..483068.255 rows=150511
> loops=1)
> Index Cond: (idsede = 8977758488::bigint)
> Total runtime: 483355.325 ms
>

The query plan looks ok. Try to do EXPLAIN ANALYZE twice and see if there is
any difference. This could reduce the IO time to read your index/data since
you got enough RAM.

Also, if you haven't done VACUUM FULL for a long time, do so and compare the
difference.

Regards,
Qingqing

Responses

Browse pgsql-performance by date

  From Date Subject
Next Message Mark Kirkwood 2005-08-09 05:05:39 Re: QRY seems not using indexes
Previous Message Steinar H. Gunderson 2005-08-09 01:08:50 Re: Why hash join instead of nested loop?