用查询方式传送还是利用中断方式传送，都需要由CPU通过执行程序来实现。这就限制了数据的传送速度。 直接内存存取(Direct Memory Access，DMA)是指数据在内存与I／O设备间的直接成块传送，即在内存与I／O设备间传送一个数据块的过程中，不需要CP
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直接内存存取(direct memory access, DMA)引擎执行了第一次拷贝(参见图1)，它从磁盘中读取文件内容，然后将它们存储到一个内核地址空间缓存区中。
The first copy (see Figure 1) is performed by the direct memory access (DMA) engine, which reads file contents from the disk and stores them into a kernel address space buffer.
叉车可直接进入巷道内存取货物，仓库利用率高。
Fork lifter may to into the passage of each row of the rack, improving the utility ratio of warehouse.
数据存取(高级)：通过划分数据模型结构和把DAO转换成直接访问XAP内存数据网格，改进读写性能。
Data access (Advanced) : By partitioning the data model structure and converting DAOs to access directly the XAP In-Memory data Grid, read and write performance is improved.
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