How BDT Processes Messages

BDT sends its messages first to message data sets. These data sets are managed by the BDT transaction queuing integrity (TQI) address spaces, one on each processor that processes BDT commands and transactions. BDT sends the message to the data set on the processor for which the message is destined; then a message handling routine in the BDT TQI address space routes the message to the recipient (the user, operator, etc.).

If there is a problem with a message data set, BDT will terminate the data set and the messages will be routed to other destinations (according to the nature of the problem).

If a message data set is full, the messages will appear only on the system log.
If an I/O error occurs on a message data set, BDT will attempt to send the messages to the default data set.
If the default data set is full or inoperative, messages will only appear on the system log.

Note: The first valid message DD statement (BDTMxxxx DD...) in the BDT start procedure defines the default message data set.

You can also use commands to enable and disable the message data sets.