ORA-16431
        cannot expand control file
        
        
        Cause
        Additional redo log threads were added on the primary database after the standby control file was created.
        Action
        Shut down the standby database and replace the control file with a new standby control file from the primary database or change the COMPATIBLE parameter to 10.2.0 or above and restart the standby database.
        
     
    
    
        ORA-16431
        cannot expand control file
        
        
        Cause
        Additional redo log threads were added on the primary database after the standby control file was created.
        Action
        Shut down the standby database and replace the control file with a new standby control file from the primary database or change the COMPATIBLE parameter to 10.2.0 or above and restart the standby database.
        
     
    
    
        ORA-16431
        cannot expand control file
        
        
        Cause
        Additional redo log threads were added on the primary database after the standby control file was created.
        Action
        Shut down the standby database and replace the control file with a new standby control file from the primary database or change the COMPATIBLE parameter to 10.2.0 or above and restart the standby database.