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MQSeries Transaction Dispatcher

The CA Gen Transaction Dispatcher for CICS (TDC) is an optional enhancement designed to overcome some of the queuing and triggering limitations experienced with the previous implementations. It also provides additional operational and administrative options within MQSeries (MQS) and CICS. With the TDC enabled:

• Trigger events result in fully processing, or emptying, the queue.
• Queues may contain mixed CA Gen messages and are not limited to a single server manager.
• A user exit can control multi-programming and dispatching the TDC.
• Transaction level security may be implemented, associating client userids with individual server manager transactions in CICS.

The TDC consists of a CICS transaction TITD, program TIRMQTDC, and an optional user exit/control program, TIRMQTDZ. It runs as a front-end for MQ-enabled server managers within the CICS region. Select the TDC by designating the TITD transaction, not the Server Manager transaction, as the process associated with an MQSeries queue definition.

Server Managers can continue to use the current methodology, that is, Server Manager direct to MQS, and require no changes to take advantage of the TDC.

MQSeries TDC can take advantage of transactional security. Transactional security refers to starting the server transaction with the client application's userid, not the password. The server starts in CICS as a non-terminal task and thus can only use CICS transactional security with surrogate security checking.