Re: Plea for Query Tuning Help

What I mean by "can decide" is that it will compute the costs with and without materializing, and choose the lowest cost. So the hint is redundant, but like all hints, they are there to help you in case CBO computes a wrong cost for whatever reason.

rgds

On 9/13/06, Norman Dunbar <norman.dunbar_at_environment-agency.gov.uk> wrote:
>
>
> Morning "Ghassan Salem",
>
> >> "Ghassan Salem" <salem.ghassan_at_gmail.com> 09/13/06 08:45am >>>
> >> if you use the "view" several times in the query, CBO can decide to
> >> materialize it, without the hint.
>
> Thanks for that. One question - and I'm nit picking here - where you
> say 'CBO can decide' do you mean it 'will always' or 'might' ?
>
> In the latter case the hint would probably be benficial, in the former,
> the hint os obviously redundant.
>
> I'm asking because (a) I don't know and (b) I'm too lazy to look it up
> at the moment :o)
>
> Cheers,
> Norman.
>
> Norman Dunbar.
> Contract Oracle DBA.
> Rivers House, Leeds.
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