What do you mean, I can’t set the maximum queue depth?

MQ on z/OS, Z/OS 1 Minute

Ive been involved with MQ for the whole of its life (I worked on the very first release), and I’ve just discovered something which is really basic!

I was testing out some code, and wanted to set the max depth of the queue to a low value for the duration of a test.

I thought this was easy; just use MQSET, specify parameter MQIA_MAX_Q_DEPTH, and the value I wanted (9).

When it reported

Reason 2067: FAILED: MQRC_SELECTOR_ERROR

I added in extra code to printout the values and yes, this was the value returned. If this was a bug I was sure it would have been spotted many years ago. I checked the documentation (remember, if all else fails, read the documentation). Look, I can set get inhibit, put inhibit etc ahh – max depth was not listed.

So when you get Reason 2067: FAILED: MQRC_SELECTOR_ERROR please check the documentation.

Published by Colin Paice

I retired from IBM where I worked on MQ on z/OS, and did customer stuff. I retired, and keep my hand in with MQ, by playing with it! I'm now an #IBMChampion from my work trying to make z/OS product more usable.

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