RE: Query Transformation
Date: Mon, 25 Jan 2021 12:03:53 +0000
Message-ID: <20040_1611576253_600EB3BD_20040_10670_1_d1a838ef3e05496a9c7713ec3609b9ca_at_vontobel.com>
Cost based ORE generally produces good execution plans on our databases. But there were some isolated cases – clearly bugs - where we had to switch it off.
Best regards,
Nenad
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Jonathan Lewis
Sent: Montag, 25. Januar 2021 12:46
To: oracle-l <oracle-l_at_freelists.org>
Subject: Re: Query Transformation
"Doesn't work at all" might be a little bit of hyperbole, but I've just done a quick search on MOS for "_optimizer_cbqt_or_expansion" and it reported a significant number of documents and bugs which suggested it be set to OFF.
Regards
Jonathan Lewis
On Mon, 25 Jan 2021 at 11:13, Moustafa Ahmed <moustafa_dba_at_hotmail.com<mailto:moustafa_dba_at_hotmail.com>> wrote: I heard from someone in oracle real world performance team that
_optimizer_cbqt_or_expansion
Must be disabled at 19c
As it has a bug and it does not work at all!
On Jan 25, 2021, at 5:44 AM, Patrick Jolliffe <jolliffe_at_gmail.com<mailto:jolliffe_at_gmail.com>> wrote: cost-based or-expansion
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