Re: Ԍ׉Œ: [GENERAL] GEQO and KSQO problem.

From: Herouth Maoz <herouth(at)oumail(dot)openu(dot)ac(dot)il>
To: "Natalya S(dot) Makushina" <mak(at)rtsoft(dot)msk(dot)ru>, "pgsql-general(at)postgreSQL(dot)org" <pgsql-general(at)postgreSQL(dot)org>
Subject: Re: Ԍ׉Œ: [GENERAL] GEQO and KSQO problem.
Date: 1999-09-06 15:03:54
Message-ID: l03130305b3f986e213ce@[147.233.159.109]
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At 17:31 +0300 on 06/09/1999, Natalya S. Makushina wrote:

>
> I can put the part of query outside the parentheses.
...
> But if i increased number of "OR" in query, the server was down and
>worked very,very slowly. I can't see any rezult from optimizer.
> It's very strange thing!

The postgres optimizer was never very good with OR clauses. That's why I
suggested the format with the regular expressions in the end of my message.
I wonder if you can get a better result by using a union:

SELECT .....
WHERE
....
AND lower(SOTRUD.EMAIL) LIKE '%matukin(at)hotmail(dot)com%'
UNION
SELECT .....
WHERE
....
AND lower(SOTRUD.EMAIL) LIKE '%knirti(at)kaluga(dot)ru%'
...

etc.

Also try UNION ALL.

Herouth

--
Herouth Maoz, Internet developer.
Open University of Israel - Telem project
http://telem.openu.ac.il/~herutma

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