From: Scott Marlowe <smarlowe@g2switchworks.com>
To: Dave Dutcher <dave@tridecap.com>
Cc: 'Jérôme BENOIS' <benois@argia-engineering.fr>
Cc: pgsql-performance@postgresql.org
Subject: Re: High CPU Load
Date: Thu, 14 Sep 2006 10:56:52 -0500
Message-ID: <1158249411.24726.17.camel@state.g2switchworks.com> (raw)
In-Reply-To: <004001c6d80e$bdef5bc0$8300a8c0@tridecap.com>
References: <004001c6d80e$bdef5bc0$8300a8c0@tridecap.com>
On Thu, 2006-09-14 at 10:02, Dave Dutcher wrote:
> > -----Original Message-----
> > From: pgsql-performance-owner@postgresql.org
> > [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of
> > Jérôme BENOIS
> >
> explain analyze select distinct
> > INTEGER_VALUE,DATE_VALUE,EI_ID,VALUE_TYPE,FLOAT_VALUE,ID,TEXT_
> > VALUE,CATEGORY_ID,STRING_VALUE,CATEGORYATTR_ID,NAME from (((
> > select distinct ei_id as EIID from mpng2_ei_attribute as
> > reqin1 where reqin1.CATEGORYATTR_ID = 0 AND reqin1.TEXT_VALUE
> > ilike '' and ei_id in ( select distinct ei_id as EIID from
> > mpng2_ei_attribute as reqin2 where reqin2.CATEGORYATTR_ID = 0
> > AND reqin2.TEXT_VALUE ilike '' and ei_id in ( select distinct
> > ei_id as EIID from mpng2_ei_attribute as reqin3 where
> > reqin3.NAME = '' AND reqin3.STRING_VALUE = '' ) ) ) ) ) as
> > req0 join mpng2_ei_attribute on req0.eiid =
> > mpng2_ei_attribute.ei_id order by ei_id asc;
>
>
> That is a lot of distinct's. Sorts are one thing that can really use up
> CPU. This query is doing lots of sorts, so its not surprising the CPU usage
> is high.
I'm gonna make a SWAG here and guess that maybe your 7.4 db was initdb'd
with a locale of C and the new one is initdb'd with a real locale, like
en_US. Can Jérôme confirm or deny this?
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To: pgsql-performance@postgresql.org
Cc: smarlowe@g2switchworks.com, dave@tridecap.com, benois@argia-engineering.fr
Subject: Re: High CPU Load
In-Reply-To: <1158249411.24726.17.camel@state.g2switchworks.com>
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