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| CICS Trigger CKTI Load Balance |
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| RobFish3 |
 Posted: Thu Nov 17, 2005 7:28 am Post subject: CICS Trigger CKTI Load Balance |
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Newbie
Joined: 23 Mar 2005
Posts: 4
Location: United Kingdom
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| We're setting up CICS - MQ triggering using CKTI. We will have 3 CICS regions to service the same transaction and queue. Each region points to the same INITQ. I've read that it is totally arbitrary as to which CICS region would get triggered. Our concern is that the workoad would become skewed in some way, so we would like to know if the process is really that hit or miss. |
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| javagate |
| Posted: Thu Nov 17, 2005 7:34 am Post subject: |
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Disciple
Joined: 15 Nov 2004
Posts: 159
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Where have you read that more then one CICS region should share/use the same INITQ? 
_________________
WebSphere Application Server 7.0 z/OS &
MQ 6.0. I work with WebSphere in the real world not in some IBM lab. |
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| wschutz |
| Posted: Thu Nov 17, 2005 7:40 am Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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| Quote: |
| I've read that it is totally arbitrary as to which CICS region would get triggered. |
You've read correctly. From MQ's perspective, CKTI is like any other mq program. If you have multiple mq gets from different programs for the same queue, there is no way to predict who's MQGET will receive the next message.
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| zpat |
| Posted: Thu Nov 17, 2005 7:52 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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Load balancing into CICS regions implies high message rates and therefore triggering is not the best way (as it causes an extra MQPUT and MQGET for every transaction request).
I prefer long-running tasks in each region, all directly GETing from the application queue, processing the transaction and then returning for another message.
They will load-balance automatically as fast they are able to process messages.
If you launch/trigger transactions (and immediately return for more messages) then you have to watch out that you don't try to run too many transactions at the same time in one region. |
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| mq_developer |
| Posted: Sun Nov 20, 2005 10:16 am Post subject: |
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Voyager
Joined: 18 Feb 2002
Posts: 82
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| if load balance is the concern , i think you should look into clustering or shared queues - both of them provide a better load balancing capabilities and has it own advantages & disadvantages and they can be used together too .. |
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