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WebSphere MQ Series Interview Questions - 1

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How does MQ support the Integration?

Ans. Because the MQ is independent of the Operating System you use i.e. it may be Windows, Solaris,AIX.It is independent of the protocol (i.e. TCP/IP, LU6.2, SNA, NetBIOS, UDP).It is not required that both the sender and receiver should be running on the same platform

What is Asynchrony?
Ans. With message queuing, the exchange of messages between the sending and receiving programs is independent of time. This means that the sending and receiving application programs are decoupled; the sender can continue processing without having to wait for the receiver to acknowledge receipt of the message. The target application does not even have to be running when the message is sent. It can retrieve the message after it is has been started.

What is a Message and what does it contain?
Ans: A message is a string of bytes that is meaningful to the applications that use it. Messages are used to transfer information from one application program to another (or between different parts of the same application). The applications can be running on the same platform, or on different platforms.

WebSphere MQ messages have two parts:
1. The application data. The content and structure of the application data is defined by the application programs that use it.
2. A message descriptor. The message descriptor identifies the message and contains additional control information, such as the type of message and the priority assigned to the message by the sending application. WebSphere MQ defines the format of the message descriptor. For a complete description of the message descriptor,

What is the Max Length of the message does MQ support?
Ans: The default maximum message length is 4 MB, although you can increase this to a maximum length of 100 MB (where 1 MB equals 1 048 576 bytes).

What is the difference between Persistent and Non Persistent Messages?
Ans: In Web Sphere MQ, messages can be either persistent or non persistent. Persistent messages are logged and can be recovered in the event of a WebSphere MQ failure. Thus, persistent messages are guaranteed to be delivered once and only once. Nonpersistent messages are not logged. Web Sphere still guarantees to deliver them not more than once, but it does not promise to deliver them once.

What is the effect of using Persistant messages?
Ans: Persistent messages are usually logged. Logging messages reduces the performance of your application, so use persistent messages for essential data only. If the data in a message can be discarded if the queue manager stops or fails, use a nonpersistent message.
WebSphere MQ messages:
Messages are made up of Two parts: Message descriptor, Application data
Types of messages
Datagram: A Message sent with no response expected.
Request: A Message sent for which a response is expected.
Reply: A Response Message for a requested message.
Report: A Message that describes the occurrence or event
Ex COA/COD
Sizes ?
Qmanagerà10000 Msgs Maxmsglengthà4 Mb
Queueà5000 Msgs Maxmsglengthà4 Mb
What is the attribute used to see the Message length?
Ans: MaxMsgLength

What is MQ Client?
Ans: A Web Sphere MQ client is a component that allows an application running on a system to issue MQI calls to a queue manager running on another system. The output from the call is sent back to the client, which passes it back to the application.

What is MQ Server?
Ans: A Web Sphere MQ server is a queue manager that provides queuing services to one or more clients. All the Web Sphere MQ objects, for example queues, exist only on the queue manager machine (the Web Sphere MQ server machine), and not on the client. A Web Sphere MQ server can also support local Web Sphere MQ
Applications

What are the Objects used in Web sphere MQ?
Ans: 1. Queue Manager 2. Queues
3. Channels 4. Processes 5. Name lists.

Mention the No of Characters required for creating names of the MQ objects?
Ans: For MQ Channels it is 20 Characters
For Remaining objects it is 48 characters.

What is the Default port number for MQ Queue Manager?
Ans: 1414

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