RE: Sudden plan change related to "VIEW PUSHED PREDICATE" with cost difference of 1M VS 13G
Date: Thu, 12 May 2022 09:08:03 +0000
Message-ID: <32dcfda5b341485f9ee3812ad939422f_at_vontobel.com>
Hi Pap,
The optimizer trace (event 10053) should reveal the reason for discarded JPPD.
Best regards,
Nenad
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Andy Sayer
Sent: Donnerstag, 12. Mai 2022 08:32
That monitor is still dong a nested loop for the merge into HIST, we can see it’s managed it 226 times already. I want to see what happens when it hash joins to HIST so it only has to do that big group by + table scan once and the other access as a one off table scan.
Have a play with pathfinder, it might not find anything but if it does, still the bug no into MOS and see what’s relevant. It might be something safe, it might be something that’s saving you from corruption. If Oracle has turned off predicate push down in a merge condition because of a corruption bug and doesn’t have a work around then you are just going to have to try my alternatives.
Thanks,
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To: Pap <oracle.developer35_at_gmail.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
Andy
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Received on Thu May 12 2022 - 11:08:03 CEST