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Re: [PERFORM] Slow performance with no apparent reason

From: Hannu Krosing <hannu(at)tm(dot)ee>
To: Yonatan Goraly <ygoraly(at)sbcglobal(dot)net>
Cc: pgsql-general(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] Slow performance with no apparent reason
Date: 2003-10-26 14:38:16
Message-ID: 1067179095.2604.3.camel@fuji.krosing.net (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-performance
Yonatan Goraly kirjutas P, 26.10.2003 kell 00:25:
> I am in the process of  adding PostgreSQL support for an application,
> in addition to Oracle and MS SQL.
> I am using PostgreSQL version 7.3.2, Red Hat 9.0 on Intel Pentium III
> board.
> 
> I have a query that generally looks like this:
> 
> SELECT t1.col1, t2.col1 FROM t1, t2 WHERE t1.x=t2.y AND t2.p='string'
> AND t2.q=1
> 
> This query is strikingly slow (about 100 sec when both t1 and t2 has
> about 1,200 records, compare with less than 4 sec with MS SQL and
> Oracle)

always send results of EXPLAIN ANALYZE if you ask for help on [PERFORM] 

knowing which indexes you have would also help.

and you should have run ANALYZE too.

-----------------
Hannu


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