In the previous section, we mentioned the concept of poor performance
and how users often are the first to recognize it. But what exactly is poor
performance?
Poor performance is inevitably the result of disappointment??”a user feels that the
system is not performing as expected. Consequently, you must first evaluate how
real these expectations are in the first place.
If expectations are realistic??”for example, a scenario where performance has
degraded from a previous level and the business is impacted??”you then need to identify
which of the system??™s components are causing the problems. You must refine a
general statement like ???the system is too slow??? to identify which types of operations
are too slow, what constitutes ???too slow,??? and when these operations are slowing
down. For example, the problem may occur only on specific transactions and at specific
times, or all transactions and reports may be performing below the users??™
expectations.
Once you??™ve defined the performance expected from your system, you can begin to
try to determine where your performance problem lies.
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