Have you done an ANALYZE TABLE COMPUTE STATISTICS on the table after
creating the bitmap index? If not, the cost-based optimizer won't know it
exists, and will never choose it.
Roman Gelfand wrote in message <6rdfed$7om$1_at_news.monmouth.com>...
>Platform - windows nt 4.0
>Oracle - 7.3.4.0.0
>
>I had created a bitmap index on a field which has a very low cardinality.
I
>enabled all initialization parameters affected by the bitmap index. When I
>do a select which searches bitmap indexed column, the explain shows me that
>a full table scan was done.
>
>create bitmap index rmn_x1 on secm(security_status);
>
>select sec_no, sec_shortcode where security_status = 'C';
>
>Rows Execution Plan
>------- ---------------------------------------------------
> 0 SELECT STATEMENT GOAL: CHOOSE
> 9837 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'SECM'
>
>
>
Received on Tue Aug 18 1998 - 22:58:32 CDT
