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MQSeries.net Forum IndexGeneral IBM MQ SupportMQ Active logs in Windows

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RAJESHRAMAKRISHNAN
PostPosted: Sat Sep 02, 2017 6:55 am Post subject: MQ Active logs in Windows Reply with quote

Voyager

Joined: 01 May 2004
Posts: 94

We have queue managers in Windows, AIX and Linux environments. While I see the active logs are getting updated (Last updated time stamp changing) rapidly in Aix and Linux, in windows I don't see them even being used (Though we use persistent messages). My understanding is that all the transactions would get recorded in the active logs before being committed to the Q.

For my own experiments, I created queue managers in windows and channels between them. Pumped hundreds of persistent messages(Big and Small) between them but could not see any active logs being updated in source or target queue managers. It gets updated only when I restart the QMs.

Can some one explain this behavior? Thanks very much
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bruce2359
PostPosted: Sat Sep 02, 2017 1:12 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 7817
Location: US: west coast, almost. Otherwise, enroute.

Explain "getting updated." Are you talking about file date/time stamps? File byte length?

If you run the dmpmqlog utility, is there nothing in the files?

Please be more precise.
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RAJESHRAMAKRISHNAN
PostPosted: Sat Sep 02, 2017 10:03 pm Post subject: Reply with quote

Voyager

Joined: 01 May 2004
Posts: 94

Hello Bruce
Thanks for the reply. Yes, the timestamp not getting updated. I know that length would be same
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PeterPotkay
PostPosted: Sun Sep 03, 2017 4:51 am Post subject: Reply with quote

Jedi Council

Joined: 15 May 2001
Posts: 7368

http://www.mqseries.net/phpBB2/viewtopic.php?p=351162&sid=7528dedc8236c0d411898f9613caf1b8
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Peter Potkay
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tczielke
PostPosted: Sun Sep 03, 2017 5:01 am Post subject: Reply with quote

Yatiri

Joined: 08 Jul 2010
Posts: 638
Location: Illinois, USA

Just one clarification. The recovery logs (or active logs) have nothing to do with transactions, per se. For example, if you were just using syncpoint on only non-persistent messages, the recovery logs would not be updated. If you are using persistent messages, they will be updated. It is a bit of a misnomer to call them "transaction logs".
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RAJESHRAMAKRISHNAN
PostPosted: Sun Sep 03, 2017 5:14 am Post subject: Reply with quote

Voyager

Joined: 01 May 2004
Posts: 94

Hello Jeff/tczielke and All

Many thanks for all your answers.

Thanks
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Andyh
PostPosted: Mon Sep 04, 2017 5:56 am Post subject: Reply with quote

Centurion

Joined: 29 Jul 2010
Posts: 146

Writing to the recovery logs is VERY performance sensitive, and consequently we'd rather flush the file meta-data as infrequently as possible.
On unix we use O_DSYNC (where appropriate) together with O_DIRECT (where appropriate) to minimize the transaction log writing costs.
On windows we use FILE_FLAG_NO_BUFFERING and FILE_FLAG_WRITE_THROUGH to achieve a similar outcome.
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