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MQSeries.net Forum IndexGeneral IBM MQ Supportqstatus not showing connections but messages getting cleared

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narayanarvr
PostPosted: Fri Feb 03, 2023 8:07 am Post subject: qstatus not showing connections but messages getting cleared Reply with quote

Voyager

Joined: 09 Oct 2012
Posts: 75

Hi All,

Many thanks in advance, I am having a strange issue, when I check my qstatus no application is showing connected, and open input count also showing zero, but messages are getting cleared from this queue, there is no clue which app is clearing messages?
I am using MQ9.1.

Thanks.
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bruce2359
PostPosted: Fri Feb 03, 2023 10:49 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9288
Location: US: west coast, almost. Otherwise, enroute.

Messages may be expiring. If the queue is a transmission queue, messages may have been sent to other qmgr.

If messages were non-persistent, qmgr restart would have purged them.

Tell us more. Only this one queue? What queue? What is it used for?
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Andyh
PostPosted: Fri Feb 03, 2023 1:50 pm Post subject: Reply with quote

Master

Joined: 29 Jul 2010
Posts: 227

DIS QSTATUS shows the status at the instant the command is issued and hence if the application was only briefly connected would typically show no current connections or open handles.

LGETTIME would show when the last MQGET retrieved a message and could be used to show if messages are being consumed or are expiring.
Similarly, the queue level stats for the queue in question could be used to see how the messages are being consumed.

It's often interesting to look at the ratio of the different MQI calls in queue manager scope stats to get a broad idea of application efficiency. For example, the number of MQCONN and MQOPEN calls compared to the number of messages consumed.
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bruce2359
PostPosted: Sat Feb 04, 2023 12:27 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9288
Location: US: west coast, almost. Otherwise, enroute.

More basic questions:

Is this a new behavior? Is this a new queue? A new application? Is this a recently modified application?
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I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live.
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exerk
PostPosted: Sun Feb 05, 2023 9:59 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 6311

bruce2359 wrote:
...If messages were non-persistent, qmgr restart would have purged them...

Depending on NPMCLASS (and other factors) of course...
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys.

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gbaddeley
PostPosted: Sun Feb 05, 2023 4:27 pm Post subject: Re: qstatus not showing connections but messages getting cle Reply with quote

Jedi

Joined: 25 Mar 2003
Posts: 2415
Location: Melbourne, Australia

narayanarvr wrote:
Hi All,
Many thanks in advance, I am having a strange issue, when I check my qstatus no application is showing connected, and open input count also showing zero, but messages are getting cleared from this queue, there is no clue which app is clearing messages?
I am using MQ9.1.
Thanks.

You could ask the team that supports the application. If you are feeling lucky, you could GET DISABLE the queue and wait for someone to complain.

Look at the queue depth. If it drops to zero or near zero on a regular basis (eg. every 10 mins), it is probably an app that runs on a schedule.

Also, check if there are any trigger attributes set on the queue.
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Glenn
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narayanarvr
PostPosted: Sun Feb 05, 2023 10:45 pm Post subject: qstatus not showing connections but messages getting cleared Reply with quote

Voyager

Joined: 09 Oct 2012
Posts: 75

Hi All,

Many thanks for your time in replying, this is new application, and queue is a local queue, I don't have direct access to MQ server to do more analysis, this is not transmission queue, for this queue open input count and open output count shows always zero, but messages are consumed, I will also check other properties like NPMClass, message expiry
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bruce2359
PostPosted: Mon Feb 06, 2023 7:00 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9288
Location: US: west coast, almost. Otherwise, enroute.

Display QSTATUS will only show currently connected apps, not apps recently connected. An app can connect, MQGET message(s) and disconnect in micro- or nanoseconds.

Consider enabling queue statistics and accounting to determine which apps are accessing the queue.
_________________
I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live.
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