Usage (MQLONG)

This indicates what the queue is used for.

MQUS_NORMAL

This is a queue that applications use when putting and getting messages; the queue is not a transmission queue.

MQUS_TRANSMISSION

This is a queue used to hold messages destined for remote queue managers. When an application sends a message to a remote queue, the local queue manager stores the message temporarily on the appropriate transmission queue in a special format. A message channel agent then reads the message from the transmission queue, and transports the message to the remote queue manager. For more information about configuring remote administration, see Configure queue managers for remote administration.

Only privileged applications can open a transmission queue for MQOO_OUTPUT to put messages on it directly. Usually, only utility applications do this. Ensure that the message data format is correct (see MQXQH - Transmission-queue header ) or errors might occur during the transmission process. Context is not passed or set unless one of the MQPMO_*_CONTEXT context options is specified.

To determine the value of this attribute, use the MQIA_USAGE selector with the MQINQ call.