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Channel message sequence numbering

 

The channel uses sequence numbers to assure that messages are delivered, delivered without duplication, and stored in the same order as they were taken from the transmission queue. The sequence number is generated at the sending end of the channel and is incremented by one before being used, which means that the current sequence number is the number of the last message sent. This information can be displayed using DISPLAY CHSTATUS (see WebSphere MQ Script (MQSC) Command Reference ). The sequence number and an identifier called the LUWID are stored in persistent storage for the last message transferred in a batch. These values are used during channel start-up to ensure that both ends of the link agree on which messages have been transferred successfully.

• Sequential retrieval of messages
  

• Sequence of retrieval of fast, nonpersistent messages
  

 

Parent topic:

WebSphere MQ distributed-messaging techniques

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