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| MQ msg size and depth & DLQ |
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| chye_huat_koh |
 Posted: Tue Jun 27, 2006 12:38 am Post subject: MQ msg size and depth & DLQ |
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Newbie
Joined: 26 Jun 2006
Posts: 3
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Dear friends,
Appreciate if you could help to explain me the following doubts/questions.
1) What is the maximum size for MQ messages that it can handle? Currently, I have configured it in the queue to have more than 10K of msgs received, but the service will hang or drop when the msg is more than 10K.
2) What is the maximum MQ message queue depth that we can set for a local queue?
3) Should the messages go to Dead Letter Queue when the queue is full? How do we prevent messages from going into Dead Letter Queue? If the messages go in to Dead Letter Queue, how do we retrieve the messages out from the Dead Letter Queue?
Thank you very much.
Regards,
CH |
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| Vitor |
| Posted: Tue Jun 27, 2006 12:51 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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1) Maximum message size is normally 100 Mb per message - there are some exceptions, noteably on z/OS using shared queues. The documentation for your specific platform will highlight these. There are also some ways round this programatically. The programming guides detail these.
The queue manager will NOT hang or drop if an excessively sized message is presented but will return an error code and continue. The queue manager in my expereince hangs or drops only in very exceptional circumstances.
2) The maxiumum depth of a queue is 999,999,999 messages. I suspect that you will run out of storage before you reach this limit, and even if you don't you may want to think about load balancing. This too is documented in the manuals.
3) If the queue is full a number of outcomes are possible, including the DLQ. These are documented in the administration, intercommunication and programming manuals along with strategies to prevent this. Retrieving messages from the DLQ is likewise documented.
Please note how many times I've used the word "manuals" above. This applies equally to the online info center and indeed the search facility of this forum. 
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