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 Originally Posted by mitpat121
Hi
sorry
correct display is as follows
select * from employee
where status = 1;
30
select * from employee
where status = -1;
521
Is the table 551 rows in size?
As a rule of thumbs Oracle optimizer would not use an index when more than 15% of the rows have to be retrieved - it is cheaper in terms of I/O to do a full table scan.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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