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| solomon_13000 |
 Posted: Wed Jul 02, 2008 2:01 am Post subject: dead letter queue |
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Master
Joined: 13 Jun 2008
Posts: 284
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I intend to send messages from Point A to Point B via an AliasQ (middleware). Is there a possibility that messages might drop into the dead letter queue when passing through the middleware?.
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| AkankshA |
| Posted: Wed Jul 02, 2008 2:12 am Post subject: |
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Grand Master
Joined: 12 Jan 2006
Posts: 1494
Location: Singapore
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Alias queue works only for same queue manager...
If you want to send message from one Qm to other Qm then you need to use remote queue definition(RQD)...
yes... your message can go to dead letter queue if your target queue is not defined or is full or is put disabled etc etce etc
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| solomon_13000 |
| Posted: Wed Jul 02, 2008 3:09 am Post subject: |
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Master
Joined: 13 Jun 2008
Posts: 284
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| But what about the alias queue?. Can the alias queue run out of space and cause the messages to drop into the dead letter queue?. |
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| exerk |
| Posted: Wed Jul 02, 2008 3:29 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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An alias queue, i.e. type QUEUE ALIAS, is a 'pointer' to another queue - it does not, and can not hold messages.
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| Gaya3 |
| Posted: Wed Jul 02, 2008 3:30 am Post subject: |
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Jedi
Joined: 12 Sep 2006
Posts: 2493
Location: Boston, US
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you havent read the MQ primer still.
then learn about Alias queue first...
these are fundamentals...
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Regards
Gayathri
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Do Something Before you Die |
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| solomon_13000 |
| Posted: Wed Jul 02, 2008 4:07 am Post subject: |
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Master
Joined: 13 Jun 2008
Posts: 284
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| can I say an alias queue functions as a message redirector to another queue?. So instead of having messages hit directly to a destination queue we go through an alias queue first then place the messages into the destination queue. But the thing is why an alias queue?. Is it because of security issues that we use an alias queue?. |
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| AkankshA |
| Posted: Wed Jul 02, 2008 4:14 am Post subject: |
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Grand Master
Joined: 12 Jan 2006
Posts: 1494
Location: Singapore
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Alias queue provide a level of indirection for you....
instaed of giving the same queue name to all the applications you can provide different names and also manage PUT n GET authorities...
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| exerk |
| Posted: Wed Jul 02, 2008 4:18 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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Consider the following scenario:
You have a local queue, PAYROLL.QUEUE, to which Application A needs to PUT messages - but only PUT - and Application B needs to GET messages - and only GET - from the same queue. You can set up two QA's, with symbolic names, e.g. APP_A_OUTPUT and APP_B_INPUT, that address the queue. The underlying queue name is masked, and if there is a requirement to change the underlying queue the QA's point to, this is easily achieved with minimal disruption to the applications.
Also, they can be used to reference cluster queues, thereby removing the need to authorise the application to the S.C.T.Q
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| solomon_13000 |
| Posted: Wed Jul 02, 2008 4:28 am Post subject: |
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Master
Joined: 13 Jun 2008
Posts: 284
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| suppose I have QMG1 to Point of Presence (AliasQ) to Broker(QMG3). Suppose I have 3 brokers. Each does the same transformation. So I send a message to QMG1 which then goes to Point of Presence (AliasQ). Is it possible to say that with the use of AliasQ we can do a round robin to determent which broker should the messages be sent so that load balancing can be achieved?. |
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| AkankshA |
| Posted: Wed Jul 02, 2008 4:33 am Post subject: |
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Grand Master
Joined: 12 Jan 2006
Posts: 1494
Location: Singapore
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| AkankshA wrote: |
Alias queue works only for same queue manager...
If you want to send message from one Qm to other Qm then you need to use remote queue definition(RQD)...
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| exerk |
| Posted: Wed Jul 02, 2008 4:42 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| Quote: |
| Also, they can be used to reference cluster queues... |
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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