By Rick van der Lans
''This e-book for these in enterprise and knowledge administration explains the right way to use info virtualization in enterprise intelligence structures a few basic wisdom of information warehousing, enterprise intelligence, and database expertise is assumed.''-- Reference and examine booklet News, December 2012
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This is only possible if those fact tables have been designed in such a way that they can use the same dimension tables. 4 Snowflake Schemas In a way, a snowflake schema resembles a star schema. Both organize the tables around a central fact table and use surrogate keys. 11). 11 shows, some columns are removed from the CUSTOMER table and are placed in three extra tables. A fact table in a snowflake schema has only relationships with dimension tables, just as in a star schema. Dimension tables, on the other hand, can have relationships with one another, and the relationships that exist are all one-to-many relationships.
What the operator needs is a 360-degree view of the customer. Data from the production systems and/or data warehouse won’t provide such a view because it probably only contains structured data coming from the production systems. What is needed is data from all kinds of data sources and combined, ranging from data coming from unstructured to structured sources and coming from internal to external sources. Being able to show a full picture of a specific concept is called 360-degree reporting. In most cases, 360-degree reporting is done on the lowest level of detail.
4 The Operational Data Store Whether data is coming from production systems or from a data staging area, it has to be processed (integrated, transformed, cleansed) before it can be loaded into the data warehouse (or data marts). But there might be other IT systems interested in this integrated, transformed, and cleansed version of the data. For example, the organization’s website might want to access the data in an integrated fashion, and the same might apply for a master data management system and a customer relationship system.