Page 67 - Demo

%u062c%u0645%u064a%u0639 %u0627%u0644%u062d%u0642%u0648%u0642 %u0645%u062d%u0641%u0648%u0638%u0629 %u0640 %u0627%u0625%u0644%u0639%u062a%u062f%u0627%u0621 %u0639%u0649%u0644 %u062d%u0642 %u0627%u0645%u0644%u0624%u0644%u0641 %u0628%u0627%u0644%u0646%u0633%u062e %u0623%u0648 %u0627%u0644%u0637%u0628%u0627%u0639%u0629 %u064a%u0639%u0631%u0636 %u0641%u0627%u0639%u0644%u0647 %u0644%u0644%u0645%u0633%u0627%u0626%u0644%u0629 %u0627%u0644%u0642%u0627%u0646%u0648%u0646%u064a%u0629673- The data warehouse vie includes fact tables and dimension tables. It represents the information that is stored inside the data warehouse, including precalculated totals and counts, as well as information regarding the source, date, and time of origin, added to provide historical context. 4- the business query vie is the data perspective in the data warehouse from the end-user%u2019s viewpoint. Data Warehouse Design Process: 1-The top-down approach: starts with overall design and planning. It is useful in cases where the technology is mature and well known, and where the business problems that must be solved are clear and well understood. 2- The bottom-up approach: starts with experiments and prototypes. This is useful in the early stage of business modeling and technology development. It allows an organization to move forward at considerably less expense and to evaluate the technological benefits before making significant commitments. 3- combination of the top-down and bottom-up approaches an organization can exploit the planned and strategic nature of the topdown approach while retaining the rapid implementation and opportunistic application of the bottom-up approach. 4- From software engineering point of vie a-The waterfall method:- performs a structured and systematic analysis at each step before proceeding to the next. b-The spiral method involves the rapid generation of increasingly functional systems, with short intervals between successive releases. This is considered a good choice for data warehouse development, especially for data marts, because the turnaround time is short, modifications can be done quickly, and newdesigns and technologies can be adapted in a timely manner. In general, the warehouse design process consists of the following steps: 1-Choose a business process to model:- (e.g., orders, invoices, shipments, inventory, account administration, sales, or the general