When a request initially invokes the TDC, the TDC disables triggering for the queue it is processing. The TDC re-enables triggering when the parent TDC completes processing. Since the TDC remains active (with the queue open) while messages arrive, triggering activity resembles that of using type FIRST.
Note: You must use trigger type EVERY. Whether you use trigger type FIRST or EVERY, triggers usually are generated only after the queue level falls to zero and returns to non-zero. Using trigger type EVERY assures that any new messages empty the queue, whereas trigger type FIRST risks delaying the processing of a request. Trigger type EVERY does not produce any more trigger messages than type FIRST, so there is no added risk of additional overhead.
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