问题描述：
[单选]
Identify a performance impact when using the Performance Schema．确定使用性能模式时的性能影响。（）
A．There is no impact on performance.
B．There is an overhead for querying the Performance Schema but not for having it enabled.
C．There is a constant overhead regardless of settings and workload.
D．The overhead depends on the settings of the Performance Schema.开销取决于性能模式的设置。
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