From: Marc Morin <marc@sandvine.com>
To: Andrus <eetasoft@online.ee>
To: pgsql-performance@postgresql.org
Subject: Re: Query runs too long for indexed tables
Date: Tue, 4 Apr 2006 16:03:30 -0400
Message-ID: <2BCEB9A37A4D354AA276774EE13FB8C2BCC556@mailserver.sandvine.com> (raw)
Explain analyze would be nice ;-)
> -----Original Message-----
> From: pgsql-performance-owner@postgresql.org
> [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of Andrus
> Sent: Tuesday, April 04, 2006 3:37 PM
> To: pgsql-performance@postgresql.org
> Subject: [PERFORM] Query runs too long for indexed tables
>
> I have relatively small tables (toode and rid) in fast server.
> Both tables are indexed on toode field.
>
> Following query takes long time to run.
> toode field type is char(20). It is difficult to change this
> field type.
>
> Any idea how to speed up this query ?
>
> UPDATE firma1.rid SET toode=NULL
> WHERE toode IS NOT NULL AND
> toode NOT IN (SELECT TOODE FROM firma1.TOODE);
>
> Query returned successfully: 0 rows affected, 594813 ms
> execution time.
>
> explain window shows:
>
> Seq Scan on rid (cost=2581.07..20862553.77 rows=51848 width=1207)
> Filter: ((toode IS NOT NULL) AND (NOT (subplan)))
> SubPlan
> -> Materialize (cost=2581.07..2944.41 rows=14734 width=84)
> -> Seq Scan on toode (cost=0.00..2350.34
> rows=14734 width=84)
>
>
> Andrus.
>
>
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 5: don't forget to increase your free space map settings
>
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To: pgsql-performance@postgresql.org
Cc: marc@sandvine.com, eetasoft@online.ee
Subject: Re: Query runs too long for indexed tables
In-Reply-To: <2BCEB9A37A4D354AA276774EE13FB8C2BCC556@mailserver.sandvine.com>
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