Added to this mix is the open source database success of MySQL in the data tier.

在这个组合之上，还可以用开放源码数据库MySQL建立数据层。

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End-to-end performance is improved as there are no copies of the data made between the database (or other XML data source) and the middle tier.

端到端性能得到改进，原因是不需要在数据库(或其他XML数据源)和中间层之间创建数据副本。

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The project's design ideas clear for data source - operational data store - model three-tier architecture;

该项目的设计思路明确为采用数据源—操作型数据存储—模型的三层体系结构；

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