tailieunhanh - Building the Data Warehouse Third Edition phần 10

Môi trường hoạt động của các cổ điển được xây dựng dưới sự phát triển cuộc sống được xác định rõ chu kỳ hệ thống (SDLC). Các hệ thống trong môi trường kho dữ liệu không được xây dựng theo SDLC. Các khác biệt giữa các quá trình phát triển trong môi trường hoạt động và môi trường kho dữ liệu là sau: | Uttama Reddy APPENDIX 365 for each subject Figure METH 2. Aging populated data . running tallying summary programs Managing multiple levels of granularity Refreshing living sample data if living sample tables have been built The output of this step is a populated functional data warehouse. PARAMETERS OF SUCCESS When done properly the result is an accessible comprehensible warehouse that serves the needs of the DSS community. HEURISTIC PROCESSING-METH 3 The third phase of development in the architected environment is the usage of data warehouse data for the purpose of analysis. Once the data in the data warehouse environment is populated usage may commence. There are several essential differences between the development that occurs at this level and development in other parts of the environment. The first major difference is that at this phase the development process always starts with data that is the data in the data warehouse. The second difference is that requirements are not known at the start of the development process. The third difference which is really a byproduct of the first two factors is that processing is done in a very iterative heuristic fashion. In other types of development there Uttama Reddy 366 APPENDIX for departmental repetitive reports for heuristic analytical processing DEPT1 standard requirements development for reports IND1 determine data needed for each analysis IND2 IND4 IND5 IND6 program to extract data analyze data answer question institutionalize IND3 program to merge analyze combine with other data Figure METH 3. is always a certain amount of iteration. But in the DSS component of development that occurs after the data warehouse is developed the whole nature of iteration changes. Iteration of processing is a normal and essential part of the analytical development process much more so than it is elsewhere. The steps taken in the DSS development components can be divided into two categories-the repetitively occurring .

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