RE: Need help to rewrite sql statement to improve performance

From: Stephane Paquette <stephane.paquette_at_standardlife.ca>
Date: Wed, 23 Apr 2003 14:07:27 -0800
Message-ID: <F001.005881AE.20030423140727@fatcity.com>

Since you do a full table scan, can you do it in parallel ?.

Stephane Paquette
Administrateur de bases de donnees
Database Administrator
Standard Life
www.standardlife.ca
Tel. (514) 925-7187
stephane.paquette_at_standardlife.ca <mailto:stephane.paquette_at_standardlife.ca>

-----Original Message-----

Dick
Sent: Wednesday, April 23, 2003 3:17 PM
To: Multiple recipients of list ORACLE-L

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: Stephane Paquette
  INET: stephane.paquette_at_standardlife.ca

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