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MQSeries.net Forum IndexGeneral IBM MQ SupportReset "MSGS" attribute in channel status

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krypton
PostPosted: Thu Nov 08, 2018 7:25 am Post subject: Reset "MSGS" attribute in channel status Reply with quote

Disciple

Joined: 14 Mar 2010
Posts: 158

Hi All,
is there a MQSC command to reset the "Msgs" attribute to 0 in channel status.

I think it can be done by restarting the Queue Manager, but due to live environment we are not restarting the queue manager.

Is there another way to reset this parameter?
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bruce2359
PostPosted: Thu Nov 08, 2018 8:07 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8188
Location: US: west coast, almost. Otherwise, enroute.

For what purpose? What issue/problem are you seeing?

From https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_7.5.0/com.ibm.mq.explorer.doc/e_status_channel.htm
Quote:
MSGS - The number of messages that have been sent or received (or, for server-connection channels, the number of MQI calls handled) since the channel was started.

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krypton
PostPosted: Thu Nov 08, 2018 8:28 am Post subject: Reply with quote

Disciple

Joined: 14 Mar 2010
Posts: 158

Hi Bruce,

I want to reset it to 0 before the start of day so that end of day we know how many messages went through this sender channel.

Another way, i can just note down what is the current number in Msgs attribute and subtract that from the count at the end of day.

But, i was looking for a clean way, where i don't have to do this subtraction.
bruce2359 wrote:
For what purpose? What issue/problem are you seeing?

From https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_7.5.0/com.ibm.mq.explorer.doc/e_status_channel.htm
Quote:
MSGS - The number of messages that have been sent or received (or, for server-connection channels, the number of MQI calls handled) since the channel was started.

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exerk
PostPosted: Thu Nov 08, 2018 9:14 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 5955

krypton wrote:
...I want to reset it to 0 before the start of day so that end of day we know how many messages went through this sender channel...

Any of your channels are set to NPMSPEED(FAST)? Any of your channels likely to have so many messages down them that the counter will wrap?
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bruce2359
PostPosted: Thu Nov 08, 2018 10:09 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8188
Location: US: west coast, almost. Otherwise, enroute.

krypton wrote:
But, i was looking for a clean way, where i don't have to do this subtraction.

Write a short shell script (launched by cron or some other automation) that displays channel status MSGS, then saves the value in a file. The script can do the math, subtracting the previous MSGS value from the current MSGS value. Voila!
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hughson
PostPosted: Sun Nov 11, 2018 3:24 pm Post subject: Reply with quote

Sentinel

Joined: 09 May 2013
Posts: 840
Location: Bay of Plenty, New Zealand

The number of MSGS a SDR channel has sent counts from the time the channel started.

Therefore, if you want to "reset" the number of MSGS to zero, you can STOP and reSTART the channel.

Cheers,
Morag
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gbaddeley
PostPosted: Sun Nov 11, 2018 3:54 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1898
Location: Melbourne, Australia

Note that the channel status attributes that count messages, bytes etc. can wrap when they exceed their integer representation capacity.
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Glenn
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bruce2359
PostPosted: Mon Nov 12, 2018 5:41 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8188
Location: US: west coast, almost. Otherwise, enroute.

Stopping and restarting a channel is a poor business solution for determining message rates. After all, stopping the channel stops message flow. Better you should brush up on basic math skills.
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krypton
PostPosted: Mon Nov 12, 2018 6:52 am Post subject: Reply with quote

Disciple

Joined: 14 Mar 2010
Posts: 158

hughson wrote:
The number of MSGS a SDR channel has sent counts from the time the channel started.

Therefore, if you want to "reset" the number of MSGS to zero, you can STOP and reSTART the channel.

Cheers,
Morag


Thanks again Morag for the reply, as restarting channel in PROD environment is not a good idea, I would stick to manually calculating the difference in Channel count.
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krypton
PostPosted: Mon Nov 12, 2018 6:56 am Post subject: Reply with quote

Disciple

Joined: 14 Mar 2010
Posts: 158

exerk wrote:
krypton wrote:
...I want to reset it to 0 before the start of day so that end of day we know how many messages went through this sender channel...

Any of your channels are set to NPMSPEED(FAST)? Any of your channels likely to have so many messages down them that the counter will wrap?


Hi Exerk, we do not have that many messages to cause the counter to wrap.
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exerk
PostPosted: Mon Nov 12, 2018 6:58 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 5955

krypton wrote:
exerk wrote:
krypton wrote:
...I want to reset it to 0 before the start of day so that end of day we know how many messages went through this sender channel...

Any of your channels are set to NPMSPEED(FAST)? Any of your channels likely to have so many messages down them that the counter will wrap?


Hi Exerk, we do not have that many messages to cause the counter to wrap.

And NPMSPEED?
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gbaddeley
PostPosted: Mon Nov 12, 2018 3:17 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1898
Location: Melbourne, Australia

krypton wrote:
hughson wrote:
The number of MSGS a SDR channel has sent counts from the time the channel started.
Therefore, if you want to "reset" the number of MSGS to zero, you can STOP and reSTART the channel.
Cheers, Morag

Thanks again Morag for the reply, as restarting channel in PROD environment is not a good idea, I would stick to manually calculating the difference in Channel count.

If a channel goes inactive due to exceeding its disconnect interval, it will lose its MSGS count. Next time the channel starts, MSGS will commence at zero. Therefore if you are periodically sampling the channel status and calculating differences, it will underestimate the number of messages, or produce negative values.
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Glenn
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bruce2359
PostPosted: Mon Nov 12, 2018 5:56 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8188
Location: US: west coast, almost. Otherwise, enroute.

Quite a few of my clients have altered their channel defs so that they never disconnect.

But this MSGS approach is fraught with the possibility of producing incorrect counts.

Will management depend on the quality of the count data captured this way? I wouldn't.
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hughson
PostPosted: Mon Nov 12, 2018 7:45 pm Post subject: Reply with quote

Sentinel

Joined: 09 May 2013
Posts: 840
Location: Bay of Plenty, New Zealand

bruce2359 wrote:
But this MSGS approach is fraught with the possibility of producing incorrect counts.

Instead of relying on sampling the number reported by DISPLAY CHSTATUS(*) MSGS which may be reset as described above, you could instead collect channel statistics. Then you will never miss any messages in your total.

Read more in IBM Knowledge Center at Statistics messages

Cheers,
Morag
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Morag Hughson @MoragHughson
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