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| Difference in how the MSGSOUT count is incremented |
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| PeterPotkay |
 Posted: Mon Apr 11, 2011 10:19 am Post subject: Difference in how the MSGSOUT count is incremented |
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Poobah
Joined: 15 May 2001
Posts: 7722
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Here is what the info center says:
http://publib.boulder.ibm.com/infocenter/wmqv7/v7r0/topic/com.ibm.mq.csqzaj.doc/sc12840_.htm
| Quote: |
"MSGSOUT The number of messages removed from the queue by destructive (non-browse) MQGET calls since the statistics were last reset.
The count includes messages removed from the queue in units of work that have not yet been committed, but the count is not decremented if the units of work are subsequently backed out. The maximum displayable value is 999 999 999; if the number exceeds this value, 999 999 999 is displayed." |
Here is my test cases. Is this not functioning correctly / consistently, or am I interpreting the results wrong?
MQ 7.0.0 on the mainframe
Queue#1
Put 10 messages with short expiry.
Queue depth stays at 10.
When the messages are finally purged from the queue, either by an app doing an MQGET and trying to get the expired message, or the internal MQ Expiry Scavenger cleans them up, the MSGSOUT count does not get incremented. I expected this.
Queue#2
Put 10 messages with unlimited expiry.
When I browse the queue, MSGSOUT count shows 10. I did not expect this. Its bad - browses that do not remove messages are making the MSGSOUT count go up on z/OS.
MQ 7.0.1.4 on z/Linux (same behavior on MQ 6.0.2.8 on Linux x86-64)
Queue #1
Put 10 messages with short expiry.
Queue depth stays at 10.
When the messages are finally purged from the queue, either by an app doing an MQGET and trying to get the expired message, or the internal MQ Expiry Scavenger cleans them up, the dequeue count does get incremented. I did not expect this. Messages going away due to expiry are driving up the MSGSOUT count and making it seem like an app consumed them.
Queue #2
Put 10 messages with unlimited expiry.
When I browse the queue, MSGSOUT count stays at zero. I expected this.
_________________
Peter Potkay
Keep Calm and MQ On |
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