Financial institutions, especially banks, usually have really large datasets. To use that data, it must be stored in such a way that it is easily available for generating reports. The trend now is to use a data warehouse to store all your relevant data, and to use smaller data marts (subsets of the warehouse) to keep specific data sets in a convenient place. But where to start? In this article, we’ll look at one possible solution, similar to a project I worked on in the past.