Transaction_Type=share-mode

    Specifies the share mode for the load operation. The following
    share modes are available:

       Batch_Update
       Exclusive
       Protected
       Shared

    You must specify a value if you use the Transaction_Type
    qualifier. If you do not specify the Transaction_Type qualifier,
    the default share mode is Protected.

    If you specify a parallel load operation (with the Parallel
    qualifier), and constraints are defined on the table you are
    loading, Oracle Corporation recommends that you specify the
    Shared share mode, or drop the constraints prior to starting a
    parallel load operation, or specify the Noconstraints qualifier.
    See the Usage Notes for details.