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MQSeries.net Forum Index » IBM MQ API Support » queue manager failover

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dseal
PostPosted: Wed Jul 23, 2003 12:36 pm    Post subject: queue manager failover Reply with quote

Newbie

Joined: 09 Jul 2002
Posts: 2
Location: DE
We currently have a need to modify a VB app to use MQ-Series.

We plan to have a list of queue managers all with different names. If we get a failure on one (whether it be MQ or a timeout from the server application) the VB app should try to access the next queue manager in the list.

When we started we were using the amqax200.dll and using the MQSERVER environment variable. Once we had a failure we attempted to change the MQSERVER env variable and connect again which failed. We contacted IBM and they said that this will not work. They suggested using a client connection table (and recommended against using MQCONNX for some reason).

We attempted to use the client connection table with the amqax200.dll but failed. I found very little documentation on the .dll to resolve this issue. Does anyone have any sample code or some other suggestions?
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Michael Dag
PostPosted: Thu Jul 24, 2003 4:16 am    Post subject: Reply with quote

Jedi Knight

Joined: 13 Jun 2002
Posts: 2607
Location: The Netherlands (Amsterdam)
Don't know if the solution you are looking for is in there, but doing a:
MQ +VB +AMQCLCHL search on Google did return some interesting documents...

Lately I find more and more interesting MQ stuff all over the place...
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PeterPotkay
PostPosted: Tue Jul 29, 2003 8:33 am    Post subject: Reply with quote

Poobah

Joined: 15 May 2001
Posts: 7722
Did you unset the MQSERVER variable before trying to use the channel tables? MQSERVER is higher priority than the MQCHLLIB or MQCHLTAB variables, and if all three are set, MQSERVER wil be used.

I have used channel tables with mqax200 apps for years, with failover working as designed.
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