We are now going to look a bit more closely at the actual technology, most of which is open source, and developed to build data warehouse instruments. What level of knowledge should you have of these technologies? A proper awareness of their existence and main features should be enough, since, most of the time, you will be taking from them input data for your modeling activity by means of an interface provided by your programming language.

Nevertheless, as is the case with cars, knowing what is under the hood in case of a broken engine or need, for improvement is a very useful thing.