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Which three statements are true about memory buffer allocation by a MySQL Server?（）
A:Global buffers such as the InnoDB buffer pool are allocated after the server starts, and are never freed
B:Thread buffers are allocated when a client connects, and are freed when the client disconnects
C:Buffers that are needed for certain operation are allocated when the operation starts, and freed when it ends
D:User buffers are allocated at server startup and freed when the user is dropped
E:All dynamic buffers that are set with a SET GLOBAL statement immediately get allocated globally, and are never freed

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出自：Oracle认证

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