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Re: zero performance on query

From: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
To: Sidar L?pez Cruz <sidarlopez(at)hotmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: zero performance on query
Date: 2005-10-26 03:36:58
Message-ID: 20051026033658.GD16682@pervasive.com (view raw or flat)
Thread:
Lists: pgsql-admin
We need the output of EXPLAIN ANALYZE, from both versions if possible.

Also, pgsql-performance would be a better list for this...

On Tue, Oct 25, 2005 at 05:31:22PM -0600, Sidar L?pez Cruz wrote:
> what happend with postgresql 8.1b4 performance on query?
> 
> look at this:
> select count(*) from fotos where archivo not in (select archivo from 
> archivos)
> Aggregate  (cost=4899037992.36..4899037992.37 rows=1 width=0)
>  ->  Seq Scan on fotos  (cost=22598.78..4899037338.07 rows=261716 width=0)
>        Filter: (NOT (subplan))
>        SubPlan
>          ->  Materialize  (cost=22598.78..39304.22 rows=805344 width=58)
>                ->  Seq Scan on archivos  (cost=0.00..13141.44 rows=805344 
> width=58)
> 
> I WILL DIE WAITING FOR QUERY RESPONSE !!!
> --
> CREATE TABLE archivos ( archivo varchar(20)) WITHOUT OIDS;
> CREATE INDEX archivos_archivo_idx  ON archivos  USING btree(archivo);
> ~800000 rows
> --
> CREATE TABLE fotos
> (
>  cedula varchar(20),
>  nombre varchar(100),
>  apellido1 varchar(100),
>  apellido2 varchar(100),
>  archivo varchar(20)
> ) WITHOUT OIDS;
> CREATE INDEX fotos_archivo_idx  ON fotos  USING btree (archivo);
> CREATE INDEX fotos_cedula_idx   ON fotos   USING btree (cedula);
> ~500000 rows
> 
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-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby(at)pervasive(dot)com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461

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