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MQSeries.net Forum Index » WebSphere Technologies FAQ » Circular vs Linear logs: Which is better?

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royr
PostPosted: Tue Aug 28, 2001 3:14 am    Post subject: Reply with quote

Acolyte

Joined: 30 Jun 2001
Posts: 65
Location: Israel

Piyush Bhardwaj (piyush.bhardwaj@CITICORP.COM) posted a concise answer to the listserv:

Quote:

Both Linear and Circular logs serves two different scenerio so I doubt if we can classify which one is better.
What we can decide on is which suits our requirements.

With Circular logs you can do the qmgr restart recovery but you can not recreate the lost or damaged data.
Where as Linear logging can provide both restart recovery and recreation of lost or damaged data by replaying the logs.

Linear logging requires media images taken , inactive logs archived, disk management etc , so a bit of administrative overhead.
Whereas circular logs just overwrites the previous logs as the logs gets filled.



[ This Message was edited by: royr on 2001-08-28 04:17 ]
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UpkarSharma
PostPosted: Sun Feb 10, 2002 8:19 pm    Post subject: Reply with quote

Apprentice

Joined: 15 Aug 2001
Posts: 27
Location: Mumbai

One more thing I would like to ask ...
Can we change the Log Type once the Queue Manager has been created and if yes then how???????
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NickB
PostPosted: Mon Feb 11, 2002 12:57 am    Post subject: Reply with quote

Centurion

Joined: 20 May 2001
Posts: 107
Location: Zurich Financial Services

No, unfortunately you cannot alter the logging method once the queue manager has been created. You will need to save all your MQ definitions away (using the saveqmgr supportpac) and then recreate the queue manager using the new method of logging.
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