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| mqknow |
 Posted: Mon Mar 09, 2009 12:22 am Post subject: Backout Queue |
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Newbie
Joined: 09 Mar 2009
Posts: 8
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Hi,
Can any one tell me, what is Backout queue in Queue definition?
and what is it role....?
and difference between Backout queue and dead letter queue ?
Thanks a lot.... |
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| MQEnthu |
| Posted: Mon Mar 09, 2009 12:32 am Post subject: |
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Partisan
Joined: 06 Oct 2008
Posts: 329
Location: India
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The WebSphere MQ queue manager keeps a record of the number of times that each message has been backed out. When the number reaches a backout threshold (specified), the message will be put backout queue. If this fails for any reason message will be put into the dead-letter queue.
Refer to this
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| zpat |
| Posted: Mon Mar 09, 2009 12:39 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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Not true.
One of the most common misconceptions in WMQ. |
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| MQEnthu |
| Posted: Mon Mar 09, 2009 12:44 am Post subject: |
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Partisan
Joined: 06 Oct 2008
Posts: 329
Location: India
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| mqknow wrote: |
| and difference between Backout queue and dead letter queue ? |
You can define a dead letter queue at queue manager level. Messages will be placed in to this queue if they cannot be delivered to their intended destination.
Where as messages will be placed in to backout queue specified on local queu when the backout threshold is reached (as I mentioned in my previous mail)
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| mqknow |
| Posted: Mon Mar 09, 2009 1:16 am Post subject: |
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Newbie
Joined: 09 Mar 2009
Posts: 8
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Thanks for your instance reply,
Can you tell me what exactly mean of backout of message and Queue manager looking for each and every message of this task. |
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| Mr Butcher |
| Posted: Mon Mar 09, 2009 1:18 am Post subject: |
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Padawan
Joined: 23 May 2005
Posts: 1716
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| Quote: |
| Where as messages will be placed in to backout queue specified on local queu when the backout threshold is reached |
This has to be coded in the application. It will not be performed by MQSeries automatically.
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Regards, Butcher |
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| MQEnthu |
| Posted: Mon Mar 09, 2009 1:26 am Post subject: |
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Partisan
Joined: 06 Oct 2008
Posts: 329
Location: India
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| Mr Butcher wrote: |
| This has to be coded in the application. It will not be performed by MQSeries automatically. |
Yes, Sorry.. I should have been more specific/detailed while writing to novice.. Thank you.
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| fjb_saper |
| Posted: Mon Mar 09, 2009 2:34 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| Mr Butcher wrote: |
| Quote: |
| Where as messages will be placed in to backout queue specified on local queu when the backout threshold is reached |
This has to be coded in the application. It will not be performed by MQSeries automatically. |
However some JMS programs/servers (WAS) will do that auto(magically) for you. It is all in the documentation.  MQDocumentation and WAS documentation (MDB) 
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MQ & Broker admin |
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| mqknow |
| Posted: Mon Mar 09, 2009 3:06 am Post subject: |
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Newbie
Joined: 09 Mar 2009
Posts: 8
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Can you please provide me some document of MQ to get familiar with each MQ object.
Actually, I want to learn MQ series of mainframes....
Thanks in Advance |
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| MQEnthu |
| Posted: Mon Mar 09, 2009 3:12 am Post subject: |
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Partisan
Joined: 06 Oct 2008
Posts: 329
Location: India
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| mqknow wrote: |
Can you please provide me some document of MQ to get familiar with each MQ object.
Actually, I want to learn MQ series of mainframes....
Thanks in Advance |
Information Center and Manuals...Check this 
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| exerk |
| Posted: Mon Mar 09, 2009 3:12 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| mqknow wrote: |
| Can you please provide me some document of MQ to get familiar with each MQ object... |
Yep. Top of the page is the link to the Info Center where you'll find what you want.
| mqknow wrote: |
| ...Actually, I want to learn MQ series of mainframes... |
You learn WebSphere MQ, and the various differences platform-to-platform.
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| Vitor |
| Posted: Mon Mar 09, 2009 3:15 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| mqknow wrote: |
| Actually, I want to learn MQ series of mainframes.... |
Be sure that you're a) familiar with mainframes and their architecture & b) spend plenty of time with the z/OS specific mainframe documentation. There are specific differences between the way WMQ is implemented on z/OS as against the distributed platforms.
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Honesty is the best policy.
Insanity is the best defence. |
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| mqknow |
| Posted: Mon Mar 09, 2009 4:17 am Post subject: |
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Newbie
Joined: 09 Mar 2009
Posts: 8
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Thanks a lot for your reply...........This is helpful for me to explore my knowledge in MQ series......
Actually, I am working in mainframe infrastructure.....and I would like to do some hands-on MQ servers...
Do you have any idea for freeware MQ server in any.. platform to get some hands-on on MQ series technology......  |
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| vmcgloin |
| Posted: Mon Mar 09, 2009 4:23 am Post subject: |
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Knight
Joined: 04 Apr 2002
Posts: 560
Location: Scotland
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Try putting 'mq trial' into your favourite search engine...  |
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| bruce2359 |
| Posted: Mon Mar 09, 2009 5:48 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Backout requeue queuename and backout threshold are both queue attributes that sysadmins set based on application requirements.
When an application MQBACKs out a message, the qmgr increments the backout count in the MQMD before restoring it to the queue.
An application MQGETting the message can interrogate the backout count, and decide what to do with the message. For example: 1) if the backout count is less than the threshold, process the message; or 2) if the backout count reaches the sysadmin set backout threshold, move it to the queue named in the backout requeue queuename, 3) something else.
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