IBM MQ (formerly known as MQSeries) is a middleware messaging product that allows applications on different platforms to communicate asynchronously by sending and receiving messages. It guarantees message delivery and supports advanced features like triggering actions on message receipt. MQ provides a common API for applications to connect to message queues, publish/consume messages, and ensures delivery across heterogeneous systems. It is widely used to integrate legacy mainframe systems with modern platforms.

1. MQ Series
Cross Platform
Dominant Messaging sw – 70% of
market
Messaging API same on all platforms
Guaranteed one-time delivery
Two-Phase Commit
Wide EAI industry support
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2. What is it?
MQSeries is a middleware product from IBM that runs on multiple
platforms and enables applications to send messages to other
applications. Basically, the sending application PUTs a message on a
Queue, and the receiving application GETs the message from the
Queue. The sending and receiving applications do not have to be on
the same platform, and do not have to be executing at the same time.
MQSeries takes care of all the storage, logging and communications
details required to guarantee delivery of the message to the
destination queue. In most cases, it will take care of translating the
data when the source and destination use different character sets
(EBCDIC on MVS vs. ASCII on NT or Unix). All the applications have
to do is know the name of the Queue and agree on the meaning of the
message.
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3. MQ Series API (basic)
Connect to a Queue Manager
Open a queue
Put or get messages
Close a queue
Commit or roll back
Disconnect
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4. Advanced features
Triggering – automatically starting an
application to process a message
IMS & CICS Bridges – reusing legacy
transactions without modification
Confirmation of message arrival,
delivery
Grouping of messages
Load balancing
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5. MQ Application environments
IMS transaction
IMS BMP
IMS batch
OS/390 Batch
TSO
CICS
DB2 Stored
Procedure
VB program on
Windows
C program on
Windows or Unix
Supported languages include VB, C/C++, PL/1 and Cobol
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6. Local Queuing
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7. Distributed Queuing
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8. Distributed Queuing
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9. Server to Server
Client PCs
(no MQ sw at all)
Unix or NT Server
Hosting:
Queue Manager
Server sw (WebSphere,
UP, IIS, Apache, Web
server…)
OS/390 hosting:
Queue Manager
IMS
DB2
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10. Server to Server -
Server application gets it’s data using
MQ. Clients do not use MQ API
Guaranteed Delivery in effect
Server license required
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11. Client to Server
Client PCs
(MQ client sw)
Unix or NT Server
Hosting:
Queue Manager,
MQ Client support,
other server sw
OS/390 hosting:
Queue Manager
IMS
DB2
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12. Client to Server
Client applications use MQ API (linked
differently)
MQ processing actually occurs on
server within client support modules
Client licenses free
Guaranteed delivery not supported
over client – server link
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13. To what problems is MQ the
solution?
Fast, asynchronous inter-system
notification.
Data propagation
Transferring data from mainframe
systems to PC/Unix systems
Transferring data from PC/Unix systems
to mainframe systems
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14. Problem…Solution…
An event in an IMS system requires action by a
midrange system.
Modify the IMS program to PUT a message to
the midrange system. The midrange system can be
configured to start the application whenever a
message arrives.
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15. An event in an midrange system requires action by a
mainframe system.
Modify the midrange program to PUT a message to
the mainframe system. The mainframe system can
process the message :
-Immediately
-At set intervals
-On a schedule
Problem…Solution…
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16. MQSEND
UP Database
OG_Main_Download
OF_Main_Upload
MQRECV
ECS
Database
CAD
to
ECS
ECS
to
CAD
*existing ECS MPPs modified to:
1 – add XML formatting to some data
2 – MQPUT to UP incoming queue
MQ
MQ
New BMP, cycles every x minutes
1) Reads all messages from queue into buffer
2) Sorts on sequence number
3) Processes each in proper order
CAD - MQ Architecture
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17. Problem…Solution…
A PC user needs to request an overnight report that needs
data from IMS, DB2 and other files.
A VB program puts the report requirements on a queue
which is read by a batch job
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18. Problem…Solution…
Web server needs data from legacy IMS/CICS transaction.
Web server puts a message to the MQ-IMS/CICS Bridge,
which runs the transaction and returns the results on a
queue (screen-scraping without the 3270).
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19. Problem…Solution…
VB app needs data from DB2, SQL Server and IMS
VB client app puts messages on queues on NT and
mainframe systems, triggering programs which populate
reply queues on an NT system, which the VB app will read
to present to the user.
The VB client need not wait for the report to be completed.
It could spawn a separate thread that would monitor the
reply queues and notify the user when the report
was complete.
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