> #### Problem definition

> Over the last two weeks, data entry personnel at XYZ Corporation have been mentioning some slight but noteworthy delays in performing routine updates to records on the company's production system. One day, an update process might go fine, but the next day a similar transaction might take 30 to 40 seconds longer to complete. From a user's perspective, this delay is an annoying problem.

> From a system administrator's perspective, it's a bit of a mystery. He consults his system's problem log, only to find that it has been several months since there has been an application or system problem of this kind reported. This new performance issue concerns him because any indication of a performance weakness could become a real performance problem if he doesn't determine the source of the problem as soon as he can.

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