Why do you need an index on a column that rarely contains a value?

--
J

2010/10/22 Frank Caruso <caruso.fr...@gmail.com>:
> ** Oracle 10G on Solaris 10
>
> If in an index is added to a form against a single column but that column
> rarely contains a value, does it have the same impact on the database as a
> column that is indexed against a required field?
>
> My thought is that if there is no value provided for the column then the
> database does not perform any extra work to maintain the index.
>
> Thank you
>
> Frank
> _attend WWRUG10 www.wwrug.com ARSlist: "Where the Answers Are"_

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