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A common approach to solve application performance issues is to add more hardware. Which two  reasons describe why this alone does not always solve performance problems?（）
A:There may be a bottleneck in the application that additional hardware would not solve.
B:Adding more hardware is costly and time consuming.
C:Adding hardware at the application layer may place additional load on an already overloaded database, network appliance, or storage system.
D:Adding more hardware may introduce new configuration requirements that need to be tested.

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出自：Oracle认证

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