The Structure of OLAP Cubes:
A cube is a set of data that is structured hierarchically. Unlike relational databases that use two-dimensional data structures (often in the form of columns and rows in a spreadsheet), cubes are logical, multidimensional models that consist of the following elements:
* one or more dimensions
* one or more levels
* one or more hierarchies
If you’re not familiar with the structure and elements of OLAP cubes, you can go through the following series of pictures.