In this Book explains what a data warehouse is (and isn't), why it's needed, how it works, and how the traditional data warehouse can be integrated with new technologies, including the Web, to provide enhanced customer service and support and also addresses the trade-offs between normalized data warehouses and dimensional data marts. In addition, this unique overview of data warehousing reviews new subjects such as: * Data warehousing techniques for customer sales and support, both online and offline * Data warehousing for decision support, including data mining and exploration warehousing * Adoption of near-line storage techniques to vastly increase the capacity and access speed of data warehouses * Integration of data warehouses with ERP systems * The unique requirements for supporting e-businesses, including the capturing and analysis of clickstream data