Re: How to get a 10053 trace on a recursive query

From: Yong Huang <yong321_at_yahoo.com>
Date: Fri, 2 May 2008 10:20:44 -0700 (PDT)
Message-ID: <675502.62072.qm@web80607.mail.mud.yahoo.com>

I also thought that parameter determined all recursive SQLs' optimizer mode. Now I think it probably only applies to *user* recursive SQLs, code in PL/SQL, in trigger body, etc. I tested setting it false and changed my session optimizer_mode to first_rows. The SQL inside my PL/SQL anonymous block is still first_rows. This probably means the parameter when set to false does not guaranetee different optimizer mode between SQL and user recursive SQL; they may end up to be the same.

I don't think there's a way to force *system* recursive SQLs to use a certain mode.

Yong Huang

On 4/30/08, Allen, Brandon <Brandon.Allen_at_oneneck.com> wrote:
>
> Hi Gilles, yes that parameter is defaulted to TRUE in my 10.2.0.3
> system, but it is apparently not working so maybe it's a bug.
>
> NAME DESCRIPTION
> SYSTEM_VALUE
> ----------------------------------------
> --------------------------------------------------
> ----------------------------------------
> _optimizer_mode_force force setting of optimizer mode
> for user recursive TRUE
> SQL also
>
> I'll try changing it at the session level and see if it makes any
> difference.
>
> Thanks,
> Brandon

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Received on Fri May 02 2008 - 12:20:44 CDT