Re: FBIs and query_rewrite_*
- From: Adam Donahue <adonahue@xxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 06 Jul 2004 12:34:58 -0700
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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