SAP BW是SAP Business Warehouse的缩写。Data warehouse用来存储数据，而SAP BW则是data warehouse加上一些工具，这些工具用来对data warehouse中的数据进行操作，产生一些有用的信息。
SAP BW-EML则代表SAP BW Enhanced Mixed Load Benchmark，一个度量性能的标准。
参考资料：
What is SAP BW and what is it used for?；
Behind the SAP BW-EML Benchmark。
本文摘自Introduction To SAP HANA Database- For Beginners。
SAP HANA是一个in-memory database，它包含下列特性：
It is a combination of hardware and software made to process massive real time data using In-Memory computing.
It combines row-based, column-based database technology.
Data now resides in main-memory (RAM) and no longer on a hard disk.
It’s best suited for performing real-time analytics, and developing and deploying real-time applications.
SAP HANA体系结构如下图所示：
