From: | Jérôme BENOIS <benois(at)argia-engineering(dot)fr> |
---|---|
To: | PostgreSQL Performance <pgsql-performance(at)postgresql(dot)org> |
Cc: | Xavier Milliard <milliard(at)argia(dot)fr>, Laurent BELMONTE <belmonte(at)argia(dot)fr> |
Subject: | BitMapScan performance degradation |
Date: | 2006-11-21 09:21:29 |
Message-ID: | 1164100889.5281.184.camel@localhost.localdomain |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
Hi All,
I have some problems with my sql query :
select distinct
INTEGER_VALUE,DATE_VALUE,EI_ID,VALUE_TYPE,FLOAT_VALUE,ID,TEXT_VALUE,CATEGORY_ID,STRING_VALUE,CATEGORYATTR_ID,NAME from ((( select d_attribute as reqin2 where reqin2.CATEGORYATTR_ID = 1041947543 AND reqin2.TEXT_VALUE ilike '%autrefois%' and ei_id in ( select distinct ei_id as EIID from MPNG2_ei_attribute as reqin3 where reqin3.NAME = 'CategoryID-1084520156' AND reqin3.STRING_VALUE = '1084520156' ) ) ) ) ) as req0 join MPNG2_ei_attribute on req0.eiid = MPNG2_ei_attribute.ei_id order by ei_id asc;
When enable_bitmapscan is enabled this query cost 51893.491 ms and when
is disabled 117.709 ms. But i heard bitmapscan feature improved
performance, can you help me ?
You can read two results of EXPLAIN ANALYZE command here :
http://sharengo.org/explain.txt
Best Regards,
Jérôme.
--
Jérôme BENOIS
Open-Source : http://www.sharengo.org
Corporate : http://www.argia-engineering.fr
JabberId : jerome.benois AT gmail.com
From | Date | Subject | |
---|---|---|---|
Next Message | Carlos H. Reimer | 2006-11-21 12:44:23 | RES: Context switching |
Previous Message | Mattias Kregert | 2006-11-20 22:36:06 | Re: Postgres server crash |