（多选题）Which three statements ar

题目描述

AGlobal buffers such as the InnoDB buffer pool are allocated after the server starts, and are never freed

BThread buffers are allocated when a client connects, and are freed when the client disconnects

CBuffers that are needed for certain operation are allocated when the operation starts, and freed when it ends

DUser buffers are allocated at server startup and freed when the user is dropped

EAll dynamic buffers that are set with a SET GLOBAL statement immediately get allocated globally, and are never freed