Hello. Trying to understand the basic SAP tools. I do not quite understand the role of the SAP BW(hereafter BW).
BW is a database, that is, it is permanently stored all information and SAP ERP only collects information? Or not?
Judging by this picture of BW is an aggregator, that is just the Manager of the information stored in the database.
But in this picture the role of the DB and BW are swapped(their order in the chain). So what is the essence of BW and how it takes place?