Transaction_Type[=(transaction_mode,options,...)]

    Allows you to specify the transaction mode, isolation level, and
    wait behavior for transactions.

    Use one of the following keywords to control the transaction
    mode:

    o  Automatic

       When Transaction_Type=Automatic is specified, the transaction
       type depends on the current database settings for snapshots
       (enabled, deferred, or disabled), transaction modes available
       to the process, and the standby status of the database.
       Automatic mode is the default.

    o  Read_Only

       Starts a READ ONLY transaction.

    o  Write

       Starts a READ WRITE transaction.

    Use one of the following options with the keyword Isolation_
    Level=[level] to specify the transaction isolation level:

    o  Read_Committed

    o  Repeatable_Read

    o  Serializable. Serializable is the default setting.

    Refer to the SET TRANSACTION statement in the Oracle Rdb SQL
    Reference Manual for a complete description of the transaction
    isolation levels.

    Specify the wait setting by using one of the following keywords:

    o  Wait

       Waits indefinitely for a locked resource to become available.
       Wait is the default behavior.

    o  Wait=n

       The value you supply for n is the transaction lock timeout
       interval. When you supply this value, Oracle Rdb waits n
       seconds before aborting the wait and the RMU Extract session.
       Specifying a wait timeout interval of zero is equivalent to
       specifying Nowait.

    o  Nowait

       Will not wait for a locked resource to become available.