Error while copying (cp) a directory in Linux “omitting directory”

When we are trying to copy a directory to other location, we get below error:

[opc@coslnxhost001 ~]$ mkdir test_dir1
[opc@coslnxhost001 ~]$ mkdir test_dir2
[opc@coslnxhost001 ~]$ touch test_dir1/test_file1.txt
[opc@coslnxhost001 ~]$ touch test_dir1/test_file2.txt

[opc@coslnxhost001 ~]$ cp test_dir1 test_dir2
cp: omitting directory ‘test_dir1’
[opc@coslnxhost001 ~]$

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How to set an Oracle Database _FIX_CONTROL (18c)

_FIX_CONTROL is a special hidden dynamic parameter introduced in 10.2.0.2 which can be used to enable or disable certain bug fixes. This is typically used in the optimizer area to allow specific fixes to be turned on or off as some fixes can have a significant effect on execution plans.

The VALUE column shows the current state of the bug fix, where 1=ON and 0=OFF.
They can be set on system level or on session level.

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