Re: bitmap conversion on a index that is not bitmapped ???

However, under Oracle 8.1.7, the default for _b_tree_bitmap_plans IS false. The default changes to true in Oracle 9, which is one of the reasons for plan differences when migrating to 9, not always for the better. Did the OP set _b_tree_bitmap_plans to true?

At 01:39 PM 10/15/2003, you wrote:
>Missed one important point. You can disable that by setting
>_b_tree_bitmap_plans to FALSE. Deleting the stats may not be a right
>apporach as that may screwup some other plans.
>
>Sorry for missing the important one..
>
>KG
>
>----- Original Message -----
>To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
>Sent: Wednesday, October 15, 2003 10:39 PM
>
>
> > John:
> >
> > Optimizer is a smart boy!!! He knows the column has few distinct values
> > and decides the BITMAP access would be appropriate and making BITMAP
> > plans from the BTree indexes. If you delete the stats for that index,
> > you will get the old behavior.
> >
> > KG
> >
> >
> >
> > =====
> > Have a nice day !!
> > ------------------------------------------------------------
> > Best Regards,
> > K Gopalakrishnan,
> > Bangalore, INDIA.
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Wolfgang Breitling
Oracle7, 8, 8i, 9i OCP DBA
Centrex Consulting Corporation
http://www.centrexcc.com

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