The following is the ORA-16540 error message, you can learn the cause and solution of the Oracle database error.
ORA-16540 invalid argument
Cause: One of the arguments for the specified request is invalid for the request type. In the case of failover, the failover level must be specified. That is, a graceful failover or a forced failover.
Solution: Verify arguments and then re-issue the request.
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