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MQSeries.net Forum Index » General IBM MQ Support » Shared queue vs non-shared queues on OS/390

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MVO
PostPosted: Mon Feb 25, 2002 8:55 am    Post subject: Reply with quote

Centurion

Joined: 09 Sep 2001
Posts: 131

Hi, I'm looking at the message length limits on OS/390. The manual says the limit is 63K for shared queues and 100MB for non-shared queues. I'm not clear on the "shared/non-shared" concepts.

Does "shared" means the queue shared by multiple queue managers in the same group of queue managers or it means the queue cannot be opened for put/get simultinuously by multiple transactions ?

Thanks

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EddieA
PostPosted: Mon Feb 25, 2002 1:01 pm    Post subject: Reply with quote

Jedi

Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles

The 1st.

Cheers,

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MVO
PostPosted: Thu Feb 28, 2002 10:12 am    Post subject: Reply with quote

Centurion

Joined: 09 Sep 2001
Posts: 131

Thanks. It means the new limits for message length on the OS/390 is 100MB if we're not sharing queue managers ?
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oz1ccg
PostPosted: Fri Mar 01, 2002 4:44 am    Post subject: Reply with quote

Yatiri

Joined: 10 Feb 2002
Posts: 628
Location: Denmark

Hi..

It's right about the limits...
But if you're planing to use 100MB messages you will have to look on the CHIN task. There is a limit on the CHIN to obtain about 1,7 GB of storage and that gives about 16 channels active on max. msg. size.
There is also some performace considerations on the MSTR task due to buffers, logs and page sets.
The introduction of message segmentation look to me as a better approch for huge messages, because of a better usage of system resources.

Thats my opinion ...



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