Re: Sudden plan change related to "VIEW PUSHED PREDICATE" with cost difference of 1M VS 13G

I have captured the snippets from the 10053 trace with JPPD keyword section as pasted in below link. But unable to see any straight forward reason like fix_control or parameter as the cause.

https://gist.github.com/oracle9999/95a65f6725e2bb65949d4909652dc59a

On Thu, 12 May 2022, 5:00 pm Noveljic Nenad, <nenad.noveljic_at_vontobel.com> wrote:

> Explain plan won’t execute the query.
>
>
>
> Look for the lines in the trace containing JPPD.
>
>
>
> *From:* Pap <oracle.developer35_at_gmail.com>
> *Sent:* Donnerstag, 12. Mai 2022 13:22
> *To:* Mohamed Houri <mohamed.houri_at_gmail.com>; Andy Sayer <
> andysayer_at_gmail.com>; Noveljic Nenad <nenad.noveljic_at_vontobel.com>
> *Cc:* Oracle L <oracle-l_at_freelists.org>
> *Subject:* Re: Sudden plan change related to "VIEW PUSHED PREDICATE" with
> cost difference of 1M VS 13G
>
>
>
> As we dont really want to run the MERGE/DML query on production. And also
> the MERGE query is not able to finish with the new path , So is it okay to
> just do like below explain plan to get the 10053 trace? Hoping that the
> MERGE query will not be executed behind the scene but just the plan will be
> generated. Please correct me if wrong here.
>
> alter session set tracefile_identifier='mergequeryplan';
>
> alter session set events='10053 trace name context forever, level 1';
>
> Explain plan for MERGE INTO HIST.....;
>
> alter session set events='10053 trace name context off';
>
>
>
> _at_Mohamed, Regarding the nested loop and hash join which is happening
> towards the end of the plan, yes both of the sql monitor which i posted for
> "post patch" are running slow.
>
> _at_Andy , Regarding the "nested loop outer" while MERGE INTO i.e at the top
> of the plan, If i see the before patch plan which was running fast, in that
> this was NESTED LOOP OUTER only. But yes as you said , i will try to force
> if at all i will be able to make that 'HASH JOIN OUTER' any way.
>
>
>
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