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MQSeries.net Forum Index » IBM MQ API Support » Linear logging - log not created

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sac063
PostPosted: Mon Nov 22, 2004 6:31 am    Post subject: Linear logging - log not created Reply with quote

Apprentice

Joined: 23 Jan 2004
Posts: 36

Hi again guys...

Hit a very interesting problem but about the same old linear logging. I am running a queue manager with linear logging, log size of 40MB. primary 5 and secondary 3 logs in number.

This was according to calculation. But I tried to stress the system by pouring messages at a very high rate and the result is below -

The log for queue manager SGUKLMB is full.

" This message is issued when an attempt to write a log record is rejected because the log is full. The queue manager will attempt to resolve the problem.

This situation may be encountered during a period of unusually high message traffic. However, if you persistently fill the log, you may have to consider enlarging the size of the log. You can either increase the number of log files by changing the values in the queue manager configuration file. You will then have to stop and restart the queue manager. Alternatively, if you need to make the log files themselves bigger, you will have to delete and recreate the queue manager "


Something that is bothering me is...why was another log not created given there was enough directory space ? It is after all liner logging ?

Will be qreat if somebody can clear this puzzle

Cheers
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Nigelg
PostPosted: Mon Nov 22, 2004 6:56 am    Post subject: Reply with quote

Grand Master

Joined: 02 Aug 2004
Posts: 1046

From the error message:
Quote:
This situation may be encountered during a period of unusually high message traffic.

This is just what you were doing!

The active log is updated at a checkpoint, which normally takes place after every 10000 queue operations, or when the queue is getting full. Naturally the checkpoint itself takes time, so if it does not complete (freeing log space) before the log is filled then you will get this message.

The solution is to define more and larger logs.
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