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RE: Need help to rewrite sql statement to improve performance

From: Goulet, Dick <DGoulet_at_vicr.com>
Date: Wed, 23 Apr 2003 11:16:51 -0800
Message-ID: <F001.00587F42.20030423111651@fatcity.com>


I'm afraid your porked. Using 'is NULL' or 'is not NULL' forces a full table scan.

Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA

-----Original Message-----
Sent: Wednesday, April 23, 2003 12:02 PM To: Multiple recipients of list ORACLE-L

We have SQL statement use "is NOT null" and this sql statement use 2.5 million memory I/O. Does their has way to improve it? Thanks.

select count(*) FROM EMP_TABLE

    where hire_date is not null
      and work_date is not null
~



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Author: Goulet, Dick
  INET: DGoulet_at_vicr.com

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San Diego, California        -- Mailing list and web hosting services
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