The data warehouse solves a number of challenging situations. For instance, it’s not a good idea if your analytics platform obtains the data directly from various external sources. It may lead to numerous security problems. Hence, the data warehouse serves as the barrier where such data is processed and prepared for further analysis.
Secondly, if we consider an e-commerce website, a direct connection of external data sources with the store’s database may lead to its overload. Finally, other types of databases may be designed according to the database normalization design scheme, which means the queries for data extraction may be too complicated and slow. In turn, the data warehouse reduces the time required to find and analyze the necessary data.