dead letter queue

基本解释

The dead-letter queue is a queue managed by the sending application's queue manager that stores messages that have failed to be delivered or have expired.
死信队列是由发送应用程序的队列管理器管理的队列，可以存储未能传递或已过期的消息。
This structure includes the name of the destination queue and the reason why the message was put on the dead-letter queue. Table 3 lists the main fields in MQDLH
该结构包含目标队列的名称和将消息放在死信队列上的原因。
In the case of delivery failure for transactional messages, the message is sent to the transactional dead-letter queue on the source computer in all negative and in-doubt cases.
一旦事务性消息传递失败，则在所有否定的和不确定的情况下，消息将被发送到源计算机上的事务性死信队列。