MaxSegmentLength (MQLONG)

This field specifies the maximum length in bytes that can be sent in a single transmission.

It is not used by the auto-definition exit. It is of interest to a channel send exit, because this exit must ensure that it does not increase the size of a transmission segment to a value greater than MaxSegmentLength. The length includes the initial 8 bytes that the exit must not change. The value is negotiated between the IBM MQ channel functions when the channel is initiated. See Writing channel-exit programs for more information about segment lengths.

The value in this field is not meaningful if ExitReason is MQXR_INIT.

This is an input field to the exit.