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Message
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| Gideon |
 Posted: Wed Mar 13, 2013 7:29 am Post subject: Reliable message |
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Chevalier
Joined: 18 Aug 2009
Posts: 403
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| When browsing a message, how do I determine if it is a reliable persistent message |
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| Vitor |
| Posted: Wed Mar 13, 2013 7:39 am Post subject: Re: Reliable message |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Gideon wrote: |
| When browsing a message, how do I determine if it is a reliable persistent message |
Check the persistence attribute of the MQMD
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| RogerLacroix |
| Posted: Wed Mar 13, 2013 7:44 am Post subject: Re: Reliable message |
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Jedi Knight
Joined: 15 May 2001
Posts: 3264
Location: London, ON Canada
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| Gideon wrote: |
| When browsing a message, how do I determine if it is a reliable persistent message |
What do you mean by "reliable"? A message is either persistent or non-persistent. There is no other state.
i.e.
| Code: |
if (msg.persistence == MQC.MQPER_PERSISTENT)
{
// it is a persistent message
}
else
{
// it is a non-persistent message
} |
Regards,
Roger Lacroix
Capitalware Inc.
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Capitalware: Transforming tomorrow into today.
Connected to MQ!
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| zpat |
| Posted: Wed Mar 13, 2013 8:19 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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| Do you mean browsing with a GUI tool? Which one? |
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| Gideon |
| Posted: Wed Mar 13, 2013 9:14 am Post subject: |
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Chevalier
Joined: 18 Aug 2009
Posts: 403
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| Vitor |
| Posted: Wed Mar 13, 2013 9:24 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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That link is for WAS not for WMQ
| Gideon wrote: |
| On the General tab, the Persistence level is shown as "Persistent", but I can not determine if this means Assured or Reliable Persistence |
Because, as my worthy associate pointed out, within WMQ there's either persistent or not persistent; there are no subtle shades of persistence.
A persistent WMQ message counts as "Assured Persistent" in the WAS link you posted. A non-persistent message counts as "Best Effort Nonpersistent"
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| Gideon |
| Posted: Wed Mar 13, 2013 10:34 am Post subject: |
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Chevalier
Joined: 18 Aug 2009
Posts: 403
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Apparently what I was looking for is actually Semi-persistent
From former posts on this former, that means that the NPMCLASS is set to HIGH
When I am using the WMQ Explorer, Rt click on the queue, and select Browse, I can not find any thing that suggests an NPM CLASS
How can I find this ? |
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| mqjeff |
| Posted: Wed Mar 13, 2013 10:40 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| Gideon wrote: |
| How can I find this ? |
restart the queue manager, see if the messages still exist on the queue. |
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| fjb_saper |
| Posted: Wed Mar 13, 2013 10:40 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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NPM class means Non Persistence Message class and determines some aspect of reliability. However remember that NPM messages cannot participate in assured delivery. 
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MQ & Broker admin |
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| mqjeff |
| Posted: Wed Mar 13, 2013 10:44 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| fjb_saper wrote: |
| NPM class means Non Persistence Message class and determines some aspect of reliability. |
NPM Class high means "the queue manager won't discard this non-persistent message when it starts up". |
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| bruce2359 |
| Posted: Wed Mar 13, 2013 11:03 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9472
Location: US: west coast, almost. Otherwise, enroute.
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| mqjeff wrote: |
| fjb_saper wrote: |
| NPM class means Non Persistence Message class and determines some aspect of reliability. |
NPM Class high means "the queue manager won't discard this non-persistent message when it starts up". |
At restart, the qmgr will make best-effort to retain non-persistent messages in an npmclass(high) queue, provided that the qmgr ended normally.
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ב''ה
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| Gideon |
| Posted: Wed Mar 13, 2013 12:00 pm Post subject: |
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Chevalier
Joined: 18 Aug 2009
Posts: 403
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I got this to work.
I set the Queue to a NPMCLASS of HIGH, and sent non-persistent messages.
Upon Qmgr restart, the messages are still there
Is this performing something like a write to disk cache, and the control goes back to WMQ without waiting for a disk write through (lazy write) ? |
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| bruce2359 |
| Posted: Wed Mar 13, 2013 12:22 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9472
Location: US: west coast, almost. Otherwise, enroute.
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| Gideon wrote: |
Is this performing something like a write to disk cache, and the control goes back to WMQ without waiting for a disk write through (lazy write) ? |
No. At qmgr shutdown, any messages remaining in buffers will be hardened (written) to queue-holding disk.
_________________
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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