Re: Why does this query need a table access by rowid?

From: Tanel Põder <tanel.poder.003_at_mail.ee>
Date: Fri, 23 Jul 2004 21:20:20 +0300
Message-ID: <357a01c470e1$b70cabf0$0a879fd9@porgand>

> Since in the index you don't have the DOC_ID column, you have only the
> function of DOC_ID in your index and Oracle isn't smart enough to look
> inside the function to see whether the funcion leaves the value
unaltered...
>
> Try to do a composite index on f(doc_id), doc_id.

(I did hit send too early..)
Of course this kind of composite index would eliminate the benefit of having smaller index, since all doc-ids would be stored in index anyway...

Tanel.

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Received on Fri Jul 23 2004 - 13:16:56 CDT