RE: different plan with insert/select
Date: Wed, 24 Jun 2020 09:31:45 +0000
Message-ID: <28932_1592991125_5EF31D95_28932_3779_1_551a2bde377b4d15a500cde061569a56_at_vontobel.com>
Thanks, Chinar.
The bug fix is enabled:
select *
from v$system_fix_control where BUGNO='22077191' ;
BUGNO VALUE SQL_FEATURE DESCRIPTION OPTIMIZER_FEATURE_ENABLE EVENT IS_DEFAULT CON_ID 22077191 1 QKSFM_TRANSFORMATION_22077191 Enable lateral view decorrelation in CTAS and IAS 12.2.0.1 0 1 0
(I’m on 19.7.0.0.200414)
Best regards,
Nenad
http://nenadnoveljic.com/blog/
From: Chinar Aliyev <chinaraliyev_at_gmail.com>
Sent: Mittwoch, 24. Juni 2020 10:25
To: Noveljic Nenad <nenad.noveljic_at_vontobel.com>
Cc: ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
Subject: Re: different plan with insert/select
Hi,
There is a case which hash join can not be used(even hinted) in insert/select and Oracle uses NL instead HJ and can cause different join order. So look at BUG22077191.
Best Regards
On Wed, 24 Jun 2020, 11:53 Noveljic Nenad, <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>> wrote: I’m getting a different execution plan for select if it runs in insert/select statement. It’s the same select - embedded in an insert statement.
There are much less join order permutations with insert/select than with select. The initial join order 1 is different.
I’m working on finding out what exactly triggers the different behavior. The original statement is rather complex, but I'm working on a simple, generic test case.
Is anybody aware of possible causes?
Best regards,
Nenad
https://nenadnoveljic.com/blog
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