单选题Identify a performance impact when using the Performance Schema.（）A There is no impact on performanceB The overhead depends on the settings of the Performance SchemaC There is an overhead for querying the Performance Schema but not for having it enable
题目
单选题
Identify a performance impact when using the Performance Schema.（）
A
There is no impact on performance
B
The overhead depends on the settings of the Performance Schema
C
There is an overhead for querying the Performance Schema but not for having it enabled
D
There is a constant overhead regardless of settings and workload