Re: Index not being used

Is the database running in Cost or Rule based mode?

Regards,
Jason.

On Wed, 18 Nov 1998 11:47:53 GMT, learmog_at_my-dejanews.com wrote:

>Problem :
>Selecting a column from a table, driving the query by a non-unique indexed
>column as follows :
>
>select CLIENT_ID
>from CLIENTS
>where CLT_TYPE= 'HAC'
>
>Table clients (and associated indexes) has been fully analyzed.
>
>Explain plan reports that a full scan will be performed on the table when I
>would expect and index range scan (using the non-unique index on CLT_TYPE) to
>be performed followed by rowid access into clients.
>
>There is about half a million rows in total in CLIENTS and only nine with
>CLT_TYPE = 'HAC'.
>
>When I delete the stats for the index, explain plan reports that it DOES use
>the index range scan followed by rowid table access, and the cost reported is
>less than prior to deleting the stats.
>
>Could somebody please tell me why the hell it isn't using the index when the
>stats are there ?
>
>-----------== Posted via Deja News, The Discussion Network ==----------
>http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
Received on Fri Nov 20 1998 - 06:58:59 CST