The access plan obtained with bind variables is a
guess plan because the optimiser lacks information.
The plan obtained with real data is a definitive plan
because the optimiser knows everything he needs in
order to make a decision.
It's nice to used bind variables to save on parsing
but real values give the optimiser more clues to
build the access plan .
HTH
- Gene Gurevich <g_u_r_e_v_i_c_h_at_yahoo.com> a
écrit : > Hi,
>
> I'm trying to tune a query which has several input
> parameters. I used the bind variables in their place
> to create an explain plan. Then I put some real
> data in their place and created another explain
> plan.
> The two plans were different. Which plan should I
> be using in my tuning? The one with the bind vars or
> the one with the real data?
>
> TIA
>
> Gene
>
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Received on Wed Jul 11 2001 - 10:27:21 CDT
