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[多选] Which two options describe how MySQL Server allocates memory?()哪两个选项描述了MySQL服务器如何分配内存?
A.Each thread allocates memory from a global pool. B.Global memory resources are allocated at server startup. 全局内存资源在服务器启动时分配。 C.Thread memory is pre-allocated up to thread_cache_size for performance. D.Each connection may have its own per-thread memory allocations. 每个连接可能有自己的每线程内存分配。
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