By Rick van der Lans

  • ''This publication for these in enterprise and knowledge administration explains how you can use information virtualization in enterprise intelligence structures… a few basic wisdom of information warehousing, enterprise intelligence, and database expertise is assumed.''--Reference and examine ebook News, December 2012


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For example, to determine the total sales per region, there is no need to store and analyze all the individual sales records. Aggregating the data on, for example, customer number is probably adequate. But for some forms of analytics, detailed data is a necessity. This is called deep analytics. When an organization wants to analyze whether trucks should be rerouted, or when it wants to determine which online ad to present, detailed data has to be analyzed. The most well-known area that requires detailed data is time-series analytics.

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. For example, for each region there are many customers, and each customer belongs to only one region.

Something unexpected happens and the organization has to react, and it has to react fast. Classic reports work well for reoccurring problems, but not for unique cases. In a classic data warehouse environment, letting users query along nondefined relationships would involve quite a lot of work. Existing tables have to be extended with new data, ETL scripts have to be adapted, and so on. But because this is an incident, there is no time to do this. In the preceding situations, what’s needed is a new form of analysis—a form where users can freely analyze data (with almost no restrictions) without the IT department having to predefine tables and relationships.

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