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| Persistant msgs Points of logging |
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| dp111443 |
 Posted: Tue Jun 24, 2008 11:46 pm Post subject: Persistant msgs Points of logging |
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Voyager
Joined: 25 Feb 2004
Posts: 82
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Hi all,
I know the general concept of linear/circular & adv's/disadv's etc. of each.
I'm trying to calculate the amount of logging space required. I know there is information in the Sys admin guide and a good page on mqseries.net where someone has done something similar, which is exellent reference for me.
The thing i'm not precisely sure about is when/where the logging of msgs take place when using linear or circular. Couple of scenario's:
1 - QM1 (MQ Server) to QM2 (MQ Server). App on QM1 puts to a cluster queue which physically exists on the QM2.
2 - MQ Client (on a PC) does a remote put to an MQ Server via a Gateway Queue Manager. e.g. Client Connects to Gateway QM, but Puts to Remote MQ Server QM and Queue.
I suspect, the messages are logged several times when taking into account of xmit queues, etc. but am not 100% sure.
Thanks,
Dharmesh
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Integration Design/Developer
IBM Certified System Administrator -
WebSphere MQ V5.3 |
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| bruce2359 |
| Posted: Wed Jun 25, 2008 6:21 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Persistent messages are logged at mqget and mqput before the message is actually put/get from the queue.
So, it is very likely that a persistent message will get logged multiple times in its lifetime.
Program A puts a message to a local queue - it is logged. Program B gets this message from the queue - it is logged again.
Program C puts a message to an xmit queue (by opening a QR definition) - the message is logged. The sending MCA mqgets the message from the xmit queue - it is logged again. The receiving MCA mqputs the message to the destination queue (or dead letter queue) - it is logged again. If the message multi-hops qmgrs - same thing.
There is no difference in this behavior between circular and linear logs.
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ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| dp111443 |
| Posted: Wed Jun 25, 2008 6:27 am Post subject: |
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Voyager
Joined: 25 Feb 2004
Posts: 82
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Bruce,
Thanks for your response. Your 3rd scenario (Program 3) is very useful as this is what I wanted to know when crossing qmgrs.
Does the same rules apply to messaging when using MQ clustering? I'm thinking it is!
Thanks,
Dharmesh
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Integration Design/Developer
IBM Certified System Administrator -
WebSphere MQ V5.3 |
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| bruce2359 |
| Posted: Wed Jun 25, 2008 8:26 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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| I'm thinking it is! |
It is.
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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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