Decision-Support Systems:Overview Data analysis tasks are simplified by specialized tools and SQL extensions Example tasks For each product category and each region,what were the total sales in the last quarter and how do they compare with the same quarter last year As above,for each product category and each customer category Statistical analysis packages (e.g.,S++)can be interfaced with databases Statistical analysis is a large field,but not covered here Data mining seeks to discover knowledge automatically in the form of statistical rules and patterns from large databases. A data warehouse archives information gathered from multiple sources,and stores it under a unified schema,at a single site. Important for large businesses that generate data from multiple divisions,possibly at multiple sites Data may also be purchased externally Database System Concepts-6th Edition 20.4 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 20.4 ©Silberschatz, Korth and Sudarshan th Edition Decision-Support Systems: Overview Data analysis tasks are simplified by specialized tools and SQL extensions Example tasks  For each product category and each region, what were the total sales in the last quarter and how do they compare with the same quarter last year  As above, for each product category and each customer category Statistical analysis packages (e.g., : S++) can be interfaced with databases Statistical analysis is a large field, but not covered here Data mining seeks to discover knowledge automatically in the form of statistical rules and patterns from large databases. A data warehouse archives information gathered from multiple sources, and stores it under a unified schema, at a single site. Important for large businesses that generate data from multiple divisions, possibly at multiple sites Data may also be purchased externally