"database busy. Open, close, mount, and dismount not allowed now"
*Cause: Some operation is in progress that expects the opened/mounted state
of this instance to remain the same.
*Action: Wait for the operation to complete then retry. If attempting to
do a shutdown, SHUTDOWN ABORT will work. If this is a shutdown
of a standby database that is operating in NO DATA LOSS mode, you
must shutdown the primary database first.