Re: FBIs and query_rewrite_*

From: Adam Donahue <adonahue_at_opsware.com>
Date: Tue, 06 Jul 2004 12:34:58 -0700
Message-ID: <40EAFEE2.7030602@opsware.com>

Found the answer to my own question, p. 349 of "Effective Oracle by Design," Tom Kyte:

    In Oracle 9i, query rewrite enabled is not necessary for built-in     functions such as UPPER or LOWER.

Adam

Adam Donahue wrote:

>Folks,
>
>Most documentation I've seen suggests that the following two parameters
>must be set to enable function-based indexes:
>
> query_rewrite_enabled=true
> query_rewrite_integrity=trusted
>
>On Oracle 9.2.0, though, I thought I read somewhere (perhaps Tom Kyte's
>book) that these are no longer required for FBIs on native Oracle
>functions, e.g., upper(). (My tests confirmed that the CBO, at least,
>generates a plan to use an FBI on upper() even when these parameters are
>disabled.)
>
>Does anyone have a pointer to official documentation confirming the above?
>
>Thanks,
>
>Adam
>
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Received on Tue Jul 06 2004 - 14:31:36 CDT