The following is the ORA-16100 error message, you can learn the cause and solution of the Oracle database error.
ORA-16100 not a valid Logical Standby database
Cause: This database has not been completely configured as a Logical Standby database.
Solution: Verify that the database is the intended Logical Standby database. Ensure that you already started logical standby apply with the
ALTER DATABASE START LOGICAL APPLY INITIAL statement. See the Oracle9i SQL Reference for the statement syntax.
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