分配接口从堆中分配给定数量的存储器，但具有不同参数和语义。
The allocation interfaces allocate a given amount of storage from the heap, but have different parameters and semantics.
该参数表示分配给锁列表的存储器大小。
This parameter indicates the amount of storage that is allocated to the lock list.
但是，如果总的缓冲区大小太大，并且没有足够的存储器可用来分配给它们，那么将为每种页大小分配最少的缓冲池，性能就会急剧下降。
However, if the total buffer size is too large, and there is not enough storage to allocate them, a minimum system buffer pool for each page size is allocated, and performance is sharply reduced.
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