Re: PK Index V Additional Column INdex

On 23 May 2005 07:06:26 -0700, "Thiko!" <biwombi_at_hotmail.com> wrote:

>Hi
>
>Having put some SQL through an EXPLAIN PLAN I can see that it is doing
>an INDEX RANGE SCAN using it's Primary Key index. This if fine.
>
>However, I tested creating an index on the column in the WHERE clause
>and re running the query through the EXPLAIN PLAN. It showed the
>explain plan to be the same but just using the new index.
>
>Would there be an advantage to having the new index created or is using
>the PK index in the exexution plan fine?
>
>This table has around 34000 rows in it.
>
>Many thanks for any advice!
>
>Thiko!

Remark one: No version
Remark two: you did gather statistics for this index? Whether the index will be used is determined by the cardinality of the query expression.
You could set event 10051 to verify the optimizers decisions.

--
Sybrand Bakker, Senior Oracle DBA