RE: Cost vs Rule

I see a new MYTH developing, and that is that RULE is better than COST. I have to believe that some thought has been put into the CBO. I also have to believe that if we all switched to RULE in the next ten minutes that the overwhelming response would not be "Wow, look at the incredible improvement in performance!"

• Ethan

-----Original Message-----
Sent: Wednesday, March 13, 2002 3:34 PM
To: Multiple recipients of list ORACLE-L

> At the request of some savvy developers, I turned
> on RBO, and it brought down execution times dramatically.

Maybe setting optimizer mode to first_rows would do the same. Then you would still be using CBO, allowing your SQL to take advantage of optimizations that are not available with RBO.

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Author: Post, Ethan
  INET: Ethan.Post_at_ps.net

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