SQL Tuning

From: Hamid Alavi <hamid.alavi_at_quovadx.com>
Date: Fri, 24 Jan 2003 11:18:47 -0800
Message-ID: <F001.00539F73.20030124111847@fatcity.com>

Hi List,

Is anybody have any idea for better performance for the following query: I just change the OR to UNION ALL
Appreciate any idea.

SELECT a.evh_event_id

        FROM event_history_evh a
        WHERE
        (a.evh_event_id = 2 AND
         a.evh_created_date = 
         (SELECT max( b.evh_created_date )
          FROM event_history_evh b
          WHERE b.evh_session_id = 1785619526 AND
          b.evh_task_list_id = a.evh_task_list_id AND 
          (sysdate - b.evh_created_date )*1440 < 5 AND
          b.evh_task_list_id != 469602))
        OR-------UNIN ALL
        (a.evh_event_id = 2 AND
         a.evh_created_date = 
         (SELECT max( c.evh_created_date )
          FROM event_history_evh c
          WHERE c.evh_session_id != 1785619526 AND
          c.evh_task_list_id = a.evh_task_list_id AND 
          (sysdate - c.evh_created_date)*1440 < 5 AND
          c.evh_task_list_id = 469602))

Hamid Alavi

Office : 818-737-0526
Cell phone : 818-416-5095

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Author: Hamid Alavi
  INET: hamid.alavi_at_quovadx.com

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