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MQSeries.net Forum IndexGeneral IBM MQ SupportWait time question and delay in getting messages

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ucbus1
PostPosted: Fri Aug 03, 2018 1:22 pm Post subject: Reply with quote

Knight

Joined: 30 Jan 2002
Posts: 559

belchman wrote:
From Dr. Google searching on key words datapower mq commit

https://www.ibm.com/support/knowledgecenter/en/SS9H2Y_7.6.0/com.ibm.dp.doc/mq_unitsofwork.html

LOL thanks.
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bruce2359
PostPosted: Fri Aug 03, 2018 3:05 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8157
Location: US: west coast, almost. Otherwise, enroute.

Is this a new app?

Has it worked before? If it worked before, what has changed?

Does every transaction cause this message delay? Or just some messages?
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ucbus1
PostPosted: Mon Aug 06, 2018 8:03 am Post subject: Reply with quote

Knight

Joined: 30 Jan 2002
Posts: 559

On further investigation noticed we were getting message not found error 2033 even when the put time on the message was bit old ,showing that the message was put 10 sec before. This could be a COMMIT issue by the datapower as some of you have suggeted. But the datapower documentation and settings suggest that the COMMIT should have happened immediately after a successful PUT. May open a ticket and see where it leads. if anyone has any further input on the issue please share.
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bruce2359
PostPosted: Mon Aug 06, 2018 8:20 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8157
Location: US: west coast, almost. Otherwise, enroute.

Run a trace on the affected qmgr to confirm whether an MQCMIT took place or not.
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ucbus1
PostPosted: Mon Aug 06, 2018 8:44 am Post subject: Reply with quote

Knight

Joined: 30 Jan 2002
Posts: 559

bruce2359 wrote:
Run a trace on the affected qmgr to confirm whether an MQCMIT took place or not.


Thanks. Since this is production queue, will running trace cause any issue?
How about running dspmqtrn?
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rammer
PostPosted: Mon Aug 06, 2018 8:55 am Post subject: Reply with quote

Partisan

Joined: 02 May 2002
Posts: 359
Location: England

ucbus1 wrote:
bruce2359 wrote:
Run a trace on the affected qmgr to confirm whether an MQCMIT took place or not.


Thanks. Since this is production queue, will running trace cause any issue?
How about running dspmqtrn?


IBM quote running trace can cause system to slow down but only by milliseconds. You will only want to put trace on for a minute or so as well due to so much data gathered. ensure you have plenty of space for storage! also review the trace options to ensure you pick the right options for your criteria.
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ucbus1
PostPosted: Mon Aug 06, 2018 9:10 am Post subject: Reply with quote

Knight

Joined: 30 Jan 2002
Posts: 559

rammer wrote:


IBM quote running trace can cause system to slow down but only by milliseconds. You will only want to put trace on for a minute or so as well due to so much data gathered. ensure you have plenty of space for storage! also review the trace options to ensure you pick the right options for your criteria.


Thanks
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bruce2359
PostPosted: Mon Aug 06, 2018 9:30 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8157
Location: US: west coast, almost. Otherwise, enroute.

Tim Zielke should be along any time now. Hes our resident trace guy.
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ucbus1
PostPosted: Mon Aug 06, 2018 11:26 am Post subject: Reply with quote

Knight

Joined: 30 Jan 2002
Posts: 559

On a different thought. could this be due to low batcsz parameter cluster receiver channel. It is currently set to 50 which I believe is default.

From IBM documentation
"Messages arriving at the receiving MCA are placed on the target application queues under syncpoint control. This means that they are not visible to any receiving applications until the commit is performed. If the batch size is large, messages may not be made available to receiving applications for some time which may have a severe impact on the message throughput of the overall system. Because the batch size is so greatly influenced by the message arrival rate on the transmission queue, it is generally recommended to set the Batchsize quite high"

Could this Batchsize parm is the issue? What is criteria and ideal value to set this Batchsize parameter?


Last edited by ucbus1 on Mon Aug 06, 2018 11:29 am; edited 2 times in total
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tczielke
PostPosted: Mon Aug 06, 2018 11:27 am Post subject: Reply with quote

Shaman

Joined: 08 Jul 2010
Posts: 736
Location: Illinois, USA

What platform is this trace being run on?
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ucbus1
PostPosted: Mon Aug 06, 2018 11:28 am Post subject: Reply with quote

Knight

Joined: 30 Jan 2002
Posts: 559

tczielke wrote:
What platform is this trace being run on?
Z/OS
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bruce2359
PostPosted: Mon Aug 06, 2018 12:32 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8157
Location: US: west coast, almost. Otherwise, enroute.

ucbus1 wrote:
tczielke wrote:
What platform is this trace being run on?
Z/OS

If z/OS, there's little/no worry about impacting performance.

OP should contact z/OS systems programmer to enable GTF trace.

https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_9.0.0/com.ibm.mq.tro.doc/q039640_.html
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tczielke
PostPosted: Mon Aug 06, 2018 12:42 pm Post subject: Reply with quote

Shaman

Joined: 08 Jul 2010
Posts: 736
Location: Illinois, USA

On z/OS, some of the monitoring tools (e.g. BMC Mainview) have their own API tracing that you can do, as well.
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ucbus1
PostPosted: Mon Aug 06, 2018 2:56 pm Post subject: Reply with quote

Knight

Joined: 30 Jan 2002
Posts: 559

bruce2359 wrote:
ucbus1 wrote:
tczielke wrote:
What platform is this trace being run on?
Z/OS

If z/OS, there's little/no worry about impacting performance.

OP should contact z/OS systems programmer to enable GTF trace.

https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_9.0.0/com.ibm.mq.tro.doc/q039640_.html


Thank you
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PeterPotkay
PostPosted: Mon Aug 06, 2018 4:25 pm Post subject: Reply with quote

Jedi Council

Joined: 15 May 2001
Posts: 7463

ucbus1 wrote:
On a different thought. could this be due to low batcsz parameter cluster receiver channel. It is currently set to 50 which I believe is default.

Could this Batchsize parm is the issue? What is criteria and ideal value to set this Batchsize parameter?

Probably not the issue unless BATCHINT is also high and there is very little traffic on the channel, causing it to wait until BATCH INTERVAL or BATCH SIZE is met.
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