Do each DateTime in fact need it's own Date and Time dimention?

Question

Lets say i have columns Time1 and Time2 in Fact table. They can differ both in time and date.

In SSAS MOLAP Cube I have statistics only for Time1 ( Standard Date dimention and my own TimeOfDay dimention). But now i need both times in statistics.

Do I need to duplicate both dimentions and underlying tables for them for each time?

Answer 1

You can use a role playing dimension. You don't need to duplicate the underlying tables. You just create a new cube dimension in your dimension usage tab. Here's a helpful link: http://technet.microsoft.com/en-us/library/ms174487%28v=sql.90%29.aspx