The WfScheduleQueue is used by workflow (and its associated tasks) to queue all timed events. Deadline checks for any workflow object with a deadline set and expression-based Synchronization Robots are executed within this queue.

The workflow queues are likely to be used heavily when many concurrent Windchill users are completing workflow tasks. Also, they are likely to be used heavily in scenarios where Windchill business objects are created that use life cycles which, in turn, use workflows.

Failed entries in workflow queues mean that something failed to process correctly. In most cases, a failed workflow queue entry corresponds to a stack trace in the method server log. Analyze the queue entry failure by checking the method server log to determine the cause of the failure. Sometimes, the message listed in the Queue Management utility can be enough to determine the cause of the failure.

You should examine workflow queues when the workflow activities associated with the queues do not appear to be executing properly. Additionally, it is good practice to periodically check the queues to clean out old entries.