ORA-38851
        cannot mark the current instance (redo thread) as disabled
        
        
        Cause
        The standby switchover or failover operation failed because it needs to mark the current instance (redo thread) as disabled.
        Action
        Shut down this instance and start up using a different instance name or redo thread number and retry.
        
     
    
    
        ORA-38851
        cannot mark the current instance (redo thread) as disabled
        
        
        Cause
        The standby switchover or failover operation failed because it needs to mark the current instance (redo thread) as disabled.
        Action
        Shut down this instance and start up using a different instance name or redo thread number and retry.
        
     
    
    
        ORA-38851
        cannot mark the current instance (redo thread) as disabled
        
        
        Cause
        The standby switchover or failover operation failed because it needs to mark the current instance (redo thread) as disabled.
        Action
        Shut down this instance and start up using a different instance name or redo thread number and retry.