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Defining a dead-letter queue

 

We recommend that each queue manager has a local queue to be used as a dead-letter queue so that messages that cannot be delivered to their correct destination can be stored for later retrieval. You must tell the queue manager about the dead-letter queue. You do this by specifying a dead-letter queue name on the crtmqm command (crtmqm -u DEAD.LETTER.QUEUE, for example), or by using the DEADQ attribute on the ALTER QMGR command to specify one later. You must define the dead-letter queue before using it.

We supply a sample dead-letter queue called SYSTEM.DEAD.LETTER.QUEUE with the product. This queue is automatically created when you create the queue manager. We can modify this definition if required, and rename it.

A dead-letter queue has no special requirements except that:

• It must be a local queue

• Its MAXMSGL (maximum message length) attribute must enable the queue to accommodate the largest messages that the queue manager has to handle plus the size of the dead-letter header (MQDLH)

WebSphere MQ provides a dead-letter queue handler that allows you to specify how messages found on a dead-letter queue are to be processed or removed. For further information, see The WebSphere MQ dead-letter queue handler.

 

Parent topic:

Defining a local queue

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