data warehousing architecture andimplementation phần 7 pdf

... Trail for Data Transformation Metadata document the transformation of source data into warehouse data. Warehouse metadata must be able to explain how a particular piece of warehouse data was ... summarized data. Figure 13-1 Metadata Example for Warehouse Fields Figure 13-2 Metadata Example for Warehouse Dimensions In data warehousing, abstraction is applied to the data...

Ngày tải lên: 14/08/2014, 06:22

... unrelated data marts. Metadata Administrator The metadata administrator defines metadata standards and manages the metadata repository of the warehouse. The workload of the Metadata Administrator ... any data warehousing effort. This chapter attempts to answer the typical questions of CIOs who participate in data warehousing initiatives. How Do I Support the Data Warehouse?...

Ngày tải lên: 14/08/2014, 06:22

... Preliminary Architecture per Rollout At a minimum, the preliminary architecture should indicate the following: • Data warehouses and data mart. Define the intended deployment of data warehouses ... and data marts for each rollout. Indicate how the different databases are related (i.e., how the databases feed one another). The warehouse architecture must ensure that the di...

Ngày tải lên: 14/08/2014, 06:22

... (http://www.pwp.starnetinc.com/larryg/index.html) Data Warehousing on the World Wide Web (http://www.datawarehousing.com) The Data- Warehouse.Com Site (http://www .data- warehouse.com/) The Data Warehousing Knowledge ... warehouse objects database. Appendix C. Online Data Warehousing Resources A number of data warehousing resources are freely available on the World...

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... Warehouse Metadata Metadata Are a Form of Abstration Why Are Metadata Important? Metadata Types Versioning Metadata as the Basis for Automating Warehousing Tasks In Summary 14. Warehousing ... Online Data Warehousing Resources C. Online Data Warehousing Resources D. Tool and Vendor Inventory D. Tool and Vendor Inventory E. Software License Agreement Metad...

Ngày tải lên: 14/08/2014, 06:22

... Enterprise Architecture, the elements of which we have discussed. Figure 1-22 The InfoMotion Architecture Differences Static Data Volatile Data Historical Data Current Data Summarized Data ... their data (e.g., credit bureaus). Also stored in the databases are the metadata that describe the contents of the data warehouse. A more thorough discussion of metadata their...

Ngày tải lên: 14/08/2014, 06:22

... the data warehouse, as illustrated in Figure 5-9 . Figure 5-9 Tiered Data Warehousing Architecture It will not be unusual to find an enterprise with the following tiered data warehousing architecture: ... Figure 5-5 Data Warehouse Components Do I Still Use Relational Databases for Data Warehousing? Although there were initial doubts about the use of relational data...

Ngày tải lên: 14/08/2014, 06:22

... Enterprise/Integrator • Data Mirror. Transformation Server • Informatica. PowerMart Designer Data Quality Tools Data quality tools assist warehousing teams with the task of locating and correcting data errors ... for the data warehouse. Several types of transformations are typically implemented in data warehousing. • Format changes. Each of the data fields in the operati...

Ngày tải lên: 14/08/2014, 06:22

... expected. Metadata as the Basis for Automating Warehousing Tasks Although metadata have traditionally been used as a form of after-the-fact documentation, there is a clear trend in data warehousing ... dimensional data warehouse or data mart into the tool. Warehouse Designer then uses the metadata as the basis for generating the SQL Data Definition Language (DDL) statements...

Ngày tải lên: 14/08/2014, 06:22

... delete data from the data warehouse or the data mart. Using Derived Columns R/OLAPXL allows you to enter formulas to derive new values based on data retrieved from the data warehouse or data ... past, the retrieved data should still be visible on the worksheet. Running the report causes R/ OLAPXL to retrieve the requested data from the database. Any previously retriev...

Ngày tải lên: 14/08/2014, 06:22