Most of the log records describe changes to WebSphere MQ queues. All such changes are made within units of recovery.
WebSphere MQ uses special logging techniques involving undo/redo and compensating log records to reduce restart times and improve system availability.
One effect of this is that the restart time is bounded. If a failure occurs during a restart so that the queue manager has to be restarted a second time, all the recovery activity that completed to the point of failure in the first restart does not need to be reapplied during a second restart. This means that successive restarts do not take progressively longer times to complete.
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