23 October, 2018
A channel provides a communication path between Queue Managers. There are two types of channels - Message Channels and MQI channels (also called Client channels).
Message channels - provide a communication path between two queue managers on the same, or different, platforms. A message channel can transmit messages in one direction only. If two-way communication is required between two queue managers, two message channels are required.There are six types of message channels
Message channels implement a protocol that includes a commitment protocol. Channels recover from failure by agreement: they must agree on the last committed unit of work [would this be harder if channels were bi- directional??]
MQI channels - connect an MQSeries client to a queue manager on a server machine (where a queue manager is defined). Used for transfer of MQI calls and responses only and is bi-directional.
Sender - Receiver Channel
Requestor - Server Channel
A message any arbitrary data that one program wants to send to another. This data is called the application data. A message needs to include other information, such as its destination and possibly a return address. This type of data is called the message descriptor
There are four types of messages:
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