Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Data Warehouses (DWs) are databases used by decision makers to analyze the status and the development of an organization. DWs are based on large amounts of data integrated from heterogeneous sources into multidimensional databases, and they are optimized for accessing data in a way that comes natural to human analysts (e.g., OLAP applications). Data in a DW are organized according to the multidimensional model, that hinges on the concepts of fact (a focus of interest for the decision-making process, such as sales and orders) and dimension (a coordinate for analyzing a fact, such as time, customer, and product). Each fact is quantified through a set of numerica measures, such as the quantity of product sold, the price of products, etc.).

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