What is the Algorithm followed in retrieving the Messages from the
Queue?
- The message can be retrieved in First-in-first-out (FIFO) basis.
- Message priority – defined in the message descriptor. Messages with same
priority are retrieved on a FIFO basis
- A specific message can be retrieved by a program request.
What is Process Definition and what are the attributes does it
contain?
- An application which starts in response to an event that is triggered in MQ
Queue Manager is defined as a process definition
- The application ID, application type and data specific to the application are
the attributes for defining process definition
What are the Types of messages?
MQ messages types are:
- Datagram – It is an unsolicited message
- Request - A message for which a response is expected
- Reply – A message event such as a confirmation on arrival or delivery. It can
be an error
MQ messages can be persistent or non-persistent
What are the message sizes?
For Queue manager, the limit is 4 MB
For a Queue the limit is 4 MB
The default memory size for Q Capture program is 64 KB
The default memory size for Q Apply program is 2 MB
What is the attribute used to see the Message length?
The attribute used to see the message length is MaxMsgLength
Explain about a) Message Client b) Message Server
a) Message Client
- A Web Sphere MQ Client is an application’s component that is running on a
system for sending MQI calls to a queue manager which is running on another
system
- The response is sent back to the client, which passes back to the application
b) Message Server
- A Web Sphere MQ Server is an application’s component that provides queuing
services to several clients
- All the MQ objects of an application, like the queues, exist only in the
queue manager machine
- Web Sphere MQ server can also support the Web Sphere MQ Applications that are
running locally
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