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By Rick van der Lans

  • ''This e-book for these in company and knowledge administration explains tips to use info virtualization in company intelligence structures… a few normal wisdom of information warehousing, enterprise intelligence, and database expertise is assumed.''--Reference and study e-book News, December 2012

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Extra resources for Data Virtualization for Business Intelligence Systems

Sample text

All these components are described in the following sections. 1 The Data Warehouse Just like engines need gas to run, reporting and analytical tools need data to operate. Without data, these products have no value. So somehow these tools need access to the data gathered in production databases, because that’s where most of the available data needed by the users resides. 3). 3 The reporting tools are connected directly to the production databases. production databases reporting environment approach, although it seems attractive because of its simplicity, will not work in most organizations, for several reasons.

It is possible to store all the tables of the staging area, the data warehouse, and the data marts in one big database managed by one database server. Whether or not this is done is purely a technical issue determined by performance, scalability, availability, and security considerations. 6 Normalized Schemas, Star Schemas, and Snowflake Schemas Each data store has a schema. The definitions of all the tables with their columns, primary keys, and foreign keys form such a schema. For example, the schema of the sample WCM database consists of the definitions of tables such as CUSTOMER, CUSTOMER_ORDER, and DVD_RELEASE.

52 CHAPTER 2 Business Intelligence and Data Warehousing Classic reporting won’t help to determine the source of the problem. Reports created with those tools will show, for example, that the sales are behind, but not why. They are restricted to showing predefined reports, and if no report has been developed to answer this question, the manager won’t find the underlying problem. Analytical tools offer the manager features to view data from all angles and at each possible level of detail.

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