Re: Composite indices and skip scanning
- From: Jocke Treugut <treugut_tuning@xxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 15 Apr 2004 15:27:23 +0200 (CEST)
Hi, Chris!
CBO will only choose a INDEX SKIP SCAN if that access
path has a lower cost than other alternatives.
CBO calcluates the cost for a ISS to be:
BLEVEL + #of distinct values of skipped column(s).
Cheers / Jocke Treugut
www.treugut-tuning.com
Höstrusk och grå moln - köp en resa till solen på Yahoo! Resor på adressen
http://se.docs.yahoo.com/travel/index.html
----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx
put 'unsubscribe' in the subject line.
--
Archives are at //www.freelists.org/archives/oracle-l/
FAQ is at //www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------
Other related posts:
