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IDS Forum

Strange time for LOGBUFF warning...

Posted By: MIKE MAGIE
Date: Monday, 23 June 2008, at 11:33 a.m.

Informix Dudettes and Dudes -

I wanna float something up the flag pole here and see if it flies. Don't yell at me if I am off base though, I am tryin' to be smart here...

On two of our production instances we got an email this morning re:

Event severity is: 3
Event class id is: 7
Event class msg is: Dynamic Server Initialization failure.
Event specific msg is: Checkpoint log record may not fit into the logical log buffer.
Recommended minimum value for LOGBUFF is 34.
See also is:
Environment is: prodserv

I looked in the online.log for this instance and saw:

09:07:03 Maximum server connections 271
09:17:03 Checkpoint Completed: duration was 0 seconds.
09:17:03 Checkpoint loguniq 57480, logpos 0x5cc018, timestamp: 0x5ce22977

09:17:03 Maximum server connections 417
09:27:03 Checkpoint Completed: duration was 0 seconds.
09:27:03 Checkpoint loguniq 57480, logpos 0x61b70c, timestamp: 0x5ce2766a

09:27:03 Maximum server connections 561
09:28:50 Checkpoint log record may not fit into the logical log buffer.
Recommended minimum value for LOGBUFF is 34.
09:32:03 Checkpoint Completed: duration was 0 seconds.
09:32:03 Checkpoint loguniq 57480, logpos 0x8b1018, timestamp: 0x5cea01ec

09:32:03 Maximum server connections 684
09:37:03 Checkpoint Completed: duration was 0 seconds.
09:37:03 Checkpoint loguniq 57480, logpos 0x8b9018, timestamp: 0x5cea0534

Although it appears we are supporting an increased user load between checkpoints, we are not exactly rolling through our logs - 749 logical log pages were used between the time of the checkpoint 9:17 and the one at 9:37. The other instance's online log is similar to this one - it does show more logging activity however.

We want to know why the engine decided to deliver the warning message that it did? Does the engine suspect that since the user load is increasing that there will likely be a corresponding increase in logging such that it delivers the warning message? Kind of like the engine saying:

"Dude we know you only have a 32 K size pool, and there are lots of swimmers who are showing up. We don't know if they are gonna swim or just sit on the side and drink margarita's but if they decide to swim you're gonna need a bigger pool."

Mike

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