From: | "Jim C(dot) Nasby" <decibel(at)decibel(dot)org> |
---|---|
To: | Ricardo Valen?a de Assis <valenca(at)campusvirtual(dot)br> |
Cc: | Bruno Wolff III <bruno(at)wolff(dot)to>, pgsql-admin(at)postgresql(dot)org |
Subject: | Re: delete to slow |
Date: | 2005-04-06 18:02:04 |
Message-ID: | 20050406180204.GG93835@decibel.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-admin |
On Wed, Apr 06, 2005 at 02:59:18PM -0300, Ricardo Valen?a de Assis wrote:
> DATABASE=# explain delete from usuario where
> usua_cd_usuario=backup.usua_cd_usuario;
> QUERY PLAN
> --------------------------------------------------------------------
> Hash Join (cost=5.71..644.15 rows=298 width=6)
> Hash Cond: ("outer".usua_cd_usuario = "inner".usua_cd_usuario)
> -> Seq Scan on usuario (cost=0.00..516.64 rows=23764 width=10)
> -> Hash (cost=4.97..4.97 rows=297 width=4)
> -> Seq Scan on backup (cost=0.00..4.97 rows=297 width=4)
> (5 rows)
>
> DATABASE=# explain delete from usuario where usua_cd_usuario in (select
> usua_cd_usuario from backup);
> QUERY PLAN
> --------------------------------------------------------------------
> Hash IN Join (cost=5.71..644.15 rows=298 width=6)
> Hash Cond: ("outer".usua_cd_usuario = "inner".usua_cd_usuario)
> -> Seq Scan on usuario (cost=0.00..516.64 rows=23764 width=10)
> -> Hash (cost=4.97..4.97 rows=297 width=4)
> -> Seq Scan on backup (cost=0.00..4.97 rows=297 width=4)
> (5 rows)
Well, neither of those should take very long at all. What's EXPLAIN
ANALYZE show?
--
Jim C. Nasby, Database Consultant decibel(at)decibel(dot)org
Give your computer some brain candy! www.distributed.net Team #1828
Windows: "Where do you want to go today?"
Linux: "Where do you want to go tomorrow?"
FreeBSD: "Are you guys coming, or what?"
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2005-04-06 18:15:39 | Re: delete to slow |
Previous Message | Dextra - Gustavo Bartz Guedes | 2005-04-06 17:59:36 | Opened Cursors |