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Orachk The Optimizer fixes for 19c database version is disabled by default for bugs with status valu

in Database Administration (MOSC) 1 commentAnswered

I see following in recommendation:

INFO => The Optimizer fixes for 19c database version is disabled by default for bugs with status value 0

DATA FROM DB02 - ORCL DATABASE - Optimizer bug fixes with disabled fix control In 19c 

--------------------------------------------------------------------------------
S.NO | ENABLED | BUG FIX  | BUG FIX DESCRIPTION
--------------------------------------------------------------------------------
 1   | No      | 22149010 | avoid multi-column semi join unnesting for NVL expressions
--------------------------------------------------------------------------------
...
--------------------------------------------------------------------------------
25   | No      | 33325981 | allow unnesting in some cases previously restricted
--------------------------------------------------------------------------------

Benefit / Impact:

There are many optimizer bug fixes included into database base release as well as in every RU. Some of the Optimizer bug fixes (not all) are controlled by _FIX_CONTROL setting and are

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