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What is the role of a database in business intelligence systems? What are some of the key requirements for databases to provide meaningful data patterns?

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The basic form of data or Information used for Business Intelligence is stored in the data bases. When the amount of data is significant (i.e. > 10 GB), we transform it into a data warehouse. A Data warehouse houses several databases, typically from several engines. That is, a given company might be Oracle-specific, but then acquires another company that is SQL Server-specific, or even half SQL Server and half DB2. Therein lies ...

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The solution discusses the role of a database in a business intelligence systems.