ORA-12843
        PDML lock is not held properly on the table.
        
        
        Cause
        The coordinator either crashed or released the lock on the partition that the parallel execution server is currently trying to acquire.
        Action
        Check if the coordinator or some of the other parallel execution servers terminated. Check that the lock is not corrupt. Retry the parallel data manipulation language (PDML).
        
     
    
    
        ORA-12843
        pdml lock not held properly on the table
        
        
        Cause
        The coodinator crashed or released the lock on the partition which the slave is trying to aquire currently.
        Action
        Check if the coordinator or some of the other slaves died. Also check that the lock has not been corrupted. Issue the pdml again.
        
     
    
    
        ORA-12843
        pdml lock not held properly on the table
        
        
        Cause
        The coodinator crashed or released the lock on the partition which the slave is trying to aquire currently.
        Action
        Check if the coordinator or some of the other slaves died. Also check that the lock has not been corrupted. Issue the pdml again.