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Are there situations where the database does not create an index when creating a unique constraint?

edited Aug 16, 2011 6:03AM in Database Administration (MOSC) 1 commentAnswered
I am running Oracle 10.2.0.4.0 - 64bit Production.

I saw a blog post that suggested that Oracle database may not create an index to enforce a unique constraint, and that if it creates an index, the index may not be unique.

Has anybody observed behavior like this?  If so, is it easily recreatable?

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