RE: Same index, different plan

  • From: "Baumgartel, Paul" <paul.baumgartel@xxxxxxxxxxxxxxxxx>
  • To: "Wolfgang Breitling" <breitliw@xxxxxxxxxxxxx>
  • Date: Fri, 4 Apr 2008 15:28:39 -0400

Indeed, and thanks.

Paul Baumgartel
Information Technology
Prime Services Databases Americas
One Madison Avenue
New York, NY 10010
Phone 212.538.1143

-----Original Message-----
From: Wolfgang Breitling [mailto:breitliw@xxxxxxxxxxxxx] 
Sent: Friday, April 04, 2008 3:24 PM
To: Baumgartel, Paul
Cc: mark.powell@xxxxxxx; oracle-l
Subject: RE: Same index, different plan

because the index hint is synonymous with index_rs. Both request an 
index range scan - and the CBO obeyed the hint ! :-)
If you want something else you have to say it: index_ffs or index_ss 
(for skip scan) and I think there are a few more.

At 12:27 PM 4/4/2008, Baumgartel, Paul wrote:
>All true, but the question is why a hint that says "use this index"
>produces a different type of scan than a query without the hint that
>uses the index anyway.
>Paul Baumgartel
>Information Technology
>Prime Services Databases Americas
>One Madison Avenue
>New York, NY 10010
>Phone 212.538.1143


Wolfgang Breitling
Centrex Consulting Corporation 

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