This is an early version of distributed unit of work, first introduced in DB2 UDB for OS/390 Version 2.2. It allows access to other DB2 UDB for OS/390 subsystems using a communications method that is private to DB2 UDB for OS/390. With this method you can connect to one location and run one query per unit of work. DB2 UDB for OS/390-to-DB2 UDB for OS/390 distributed unit of work uses an alias or a three-part name to determine the location of the subsystem and to connect to it. QMF, however, requires a minimum level of DB2 UDB for OS/390 Version 2.3 to support this type of data access. Figure 3 shows a DB2 UDB for OS/390-to-DB2 UDB for OS/390 access connection.
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