(UDM) 的作用是在用户和数据源之间搭建一座桥梁。UDM 构造于一个或多个物理数据源之上。用户使用多种客户端工具（例如，Microsoft Excel）向 UDM 发出查询。
The role of a Unified Dimensional Model (UDM) is to provide a bridge between the user and the data sources. A UDM is constructed over one or more physical data sources. The user issues queries against the UDM using a variety of client tools, such as Microsoft Excel.