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| MQCONN doubt |
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| vjsony |
 Posted: Sat Jul 06, 2002 10:21 pm Post subject: MQCONN doubt |
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Apprentice
Joined: 01 Aug 2001
Posts: 45
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Hi,
Is it possible to issue more than one MQCONN call in a program?
I issue a MQCONN call connecting to Qmgr1. Without disconnecting, I issue a MQCONN call to another Qmgr2. Will this work?
Are there any constraints for such kind of a scenario?
Awaiting your replies ..
Thanks ..
VJ |
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| nimconsult |
| Posted: Sun Jul 07, 2002 10:34 pm Post subject: |
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Master
Joined: 22 May 2002
Posts: 268
Location: NIMCONSULT - Belgium
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Yes you can issue the MQCONN multiple times.
If you issue an MQCONN on a queue manager to which you were already connected, you will receive a warning with reason code "already connected", but you can use the received handle safely.
You cannot connect to more than one queue manager if you run under CICS.
If you connect to two different queue managers (QM1 and QM2 in your question), take care of transaction management: when you issue an MQGET or MQPUT under syncpoint, the scope of the unit of work is only the connection to the queue manager. If you want a global unit of work, then you need transaction coordination between the queue managers. To achieve you either use an external transaction coordinator (COM+/MTS on Windows, RRS on batch-OS/390, Tuxedo, Encina), or configure MQ Series to act as a transactional coordinator (but I have never attempted to configure MQ Series to act as a coordinator with another MQ Series). Read the chapter on Transactional support in the MQ Series system administration manual for more information.
_________________
Nicolas Maréchal
Senior Architect - Partner
NIMCONSULT Software Architecture Services (Belgium)
http://www.nimconsult.be |
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| vjsony |
| Posted: Mon Jul 08, 2002 1:12 am Post subject: |
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Apprentice
Joined: 01 Aug 2001
Posts: 45
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Hi,
Thanks for your reply.
Could you tell me then when do we get this error MQRC_ANOTHER_Q_MGR_CONNECTED (Reason Code 2103)?
This reason code seems to indicate that you cannot simultaneously connect to more than one queue manager.
Do reply.
Thanks
VJ |
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| nimconsult |
| Posted: Mon Jul 08, 2002 2:13 am Post subject: |
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Master
Joined: 22 May 2002
Posts: 268
Location: NIMCONSULT - Belgium
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Oops, you are right, after double-check it seems that not all environments support multiple simultaneous connections.
I have personnaly tested OS/390 and COM+ applications that run perfectly with multiple connections. But on Windows for instance, non-COM+ applications cannot connect to multiple queue managers. I have tested with the "API exerciser" some minutes ago and got the RC 2103.
_________________
Nicolas Maréchal
Senior Architect - Partner
NIMCONSULT Software Architecture Services (Belgium)
http://www.nimconsult.be |
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