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oracle@training19c:~/ [rdbms19000] oerr ora 16484 16484, 00000, "compatibility setting is too low" // *Cause: The compatibility setting in the redo log transported to this // standby database exceeded the current compatibility setting. // *Action: Check the compatibility setting on the primary and standby // database, and increase the compatibility setting in the // initialization parameter file on the standby database accordingly.
.. beside the fact that both databases must either be a CDB or a Non-CDB
Is it possible to lower the compatibility of 18c database to 18.104.22.168?
Unfortunately you can't , have you checked your database current compatibility ?