Query Tuning

From: <Rajesh.Rao_at_jpmchase.com>
Date: Thu, 20 Jun 2002 08:53:41 -0800
Message-ID: <F001.00482F10.20020620085341@fatcity.com>

Hello Folks,

Given an Oracle 7.3.4 database, how would you tune a query as under, other than suggesting a migration to a higher version. This query is currently performing a lot of I/O, obviously doing a full tablescan on CAMPMAIN.

SELECT CAMPNAME,ASGNMTTYPE,CAMPRTGNUM, LTRIM(RTRIM(CAMPTYPE)) FROM CAMPMAIN
WHERE LTRIM(RTRIM(CAMPNAME)) = :b1
AND (LOAD_FAILED_FLG = 'N' OR LOAD_FAILED_FLG = '' OR LOAD_FAILED_FLG IS NULL ); This query runs in a PL/SQL loop. For now, my suggestion was to create a temporary table with all the fields and a fully trimmed CAMPNAME field outside the loop, create an index on this table, and then use this temporary table inside the loop. Any better suggestions?

Regards
Raj

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