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| Dynamic Queue |
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| ajayvizag |
 Posted: Fri Apr 17, 2009 7:02 am Post subject: Dynamic Queue |
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Apprentice
Joined: 20 Feb 2009
Posts: 31
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Hi All,
Can Anyone please tell me where exactly we use dynamic queues. And also can we specify a name to a dynamic queue. |
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| PeterPotkay |
| Posted: Fri Apr 17, 2009 7:38 am Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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This is basic information in the MQ Documentation. Open up the MQ Info Cnter and do a search on Dynamic Queues.
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Peter Potkay
Keep Calm and MQ On |
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| bruce2359 |
| Posted: Sun Apr 19, 2009 7:00 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Briefly (or maybe not):
Queues come in two broad categories: queues that system admins explicitly define (like DEFINE QLOCAL(FRED); and queues that are created during program execution by application programmers. The queues that programmers create during program execution are dynamic queues.
Dynamic queues are usually used in the request-reply programming mode. Program A creates a request message and sends it to program B, and A expects (and usually waits for) a reply message back from program B.
In a bit more detail: before program A puts the request message, it creates a reply-to-queue (based on a queue model definition that sysadmins create), and places the name of the reply-to-queue in the MQMD of the request message. Program B gets the message, does the back-end work (like inquiring on a db); and composes a reply message that it puts on the reply-to-queue that program A created.
A bit more detail: Sysadmins create the model definition with DEFINE QMODEL(model-name), with the attributes that the dynamic queue will have. This qmodel name is the name that the programmer specifies in the MQOD as the ObjectName. The naming rule for the resulting dynamic queue is placed in the DyanmicQueueName field of the MQOD. If the MQOPEN of the QModel is successful, the qmgr places the resolved queue name in the ObjectName field.
For more, take a look at the WMQ Application Programming Guide and WMQ Application Programming Reference.
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| gbaddeley |
| Posted: Mon Apr 20, 2009 5:24 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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Its also important to understand the differences and limitations of the two types of dynamic queue, Temporary and Permanent. Using the wrong type can have serious consequences.
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Glenn |
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