Re: how to get oracle to ignore an index

From: Daniel Fink <Daniel.Fink_at_Sun.COM>
Date: Fri, 06 Feb 2004 13:47:39 -0700
Message-id: <4023FD6B.2779093B@sun.com>

I believe that you would have to use a PK or a unique index w/ a Not Null constraint. Unique indexes/constraints do not preclude the existence of NULLS. This is why the PK constraint is not the same as a unique constraint.

Daniel Fink
"Bobak, Mark" wrote:

> Actually, it will ignore the index if the columns are nullable, even if =
> no null values currently exist. If you repeat your experiment w/ a =
> primary key or unique index, I think you'll find Oracle will use the =
> index when directed to do so by a hint, even if it's less efficient to =
> do so.
>
> -Mark

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Received on Fri Feb 06 2004 - 14:47:39 CST