Executive Information Systems Don't Count
Our original question was: What is a data warehouse? As we've discovered, it's a large, centralized, specialized database for doing data management and executive reporting. In the old days, we just called such databases executive information systems (EISs). A logical question is then: How is a data warehouse different from an EIS? While it may not be readily apparent, there are some key differences.
The primary difference is the intended audience. EISs were built just to support making tactical decisions, meaning they were used by mid-level management. But, an effective data warehouse will support both mid-level and true executive management for both tactical and strategic decisions. A data warehouse ...
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