HANA employs an in-memory, data source agnostic computing engine, where data to be processed is held in RAM instead of reading from secondary storage devices thus providing a performance boost.
HANA应用了常驻内存、数据源无关的计算引擎，要处理的数据存放在RAM中，而不是从二级存储设备中获取，这样提供了性能的提升。
When using many data document, advocate data file is used at storage system object and watch, secondary data file is used at memory user data and index.
采用多个数据文件时，主数据文件用于存储系统对象和表，次要数据文件用于存储用户数据和索引。
External memory, also known as secondary storage, is extension of the internal memory.
外部存储器，也称辅存，是内存的延伸。
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