RE: Sudden plan change related to "VIEW PUSHED PREDICATE" with cost difference of 1M VS 13G
Date: Thu, 12 May 2022 11:29:06 +0000
Message-ID: <575afcac11d44531978a3e3962b1c154_at_vontobel.com>
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
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.
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
_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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