In general storage engines may have their own per thread or global memory allocations which are not tuned as buffers. 通常情况下，存储引擎会设置本人的每个线程的全局分配内存，它通常不能像缓存一样可以调节。
An arrangement of core storage in which the lowest numbered storage location is the successor of the highest numbered one. 磁芯存储器的一种编排方式，其中编号最低的存储单元是编号最高的存储单元的后续。
