14. Data Warehouse Structure Highly Summarized Lightly Summarized Atomic/Detailed Departmentally Structured Individually Structured Data Warehouse Organizationally Structured Data Information
20. OLAP: 3 Tier DSS Data Warehouse Database Layer Store atomic data in industry standard Data Warehouse. OLAP Engine Application Logic Layer Generate SQL execution plans in the OLAP engine to obtain OLAP functionality. Decision Support Client Presentation Layer Obtain multi-dimensional reports from the DSS Client.
26. DM v/s ER Models DM ER Used to design database for Online Analytical Processing (OLAP) Used to design database for Online Transaction Processing (OLTP) Support ad hoc end-user queries Support defined queries Intuitive & facilitates high-performance retrieval of data Removes redundancy of data De-normalized Normalized