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From InformationWeek]
Answer: When it's a database-less appliance. Unlike some competing products, Dataupia's data warehouse appliance doesn't have its own database management system. Instead, Dataupia's appliance, called Satori Server, performs analysis on data stored in existing databases.
The article continues at
http://www.informationweek.com/blog/main/archives/2008/05/when_is_a_data.html
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