In 1993, Dr. E.F. Codd originated twelve rules as the basis for selecting OLAP tools. The publication of these rules was the result of research carried out on behalf of Arbor Software and has resulted in a formalized redefinition of the requirements for OLAP tools. These rules are:
- Multi-dimensional conceptual view of database
- Concept of transparency
- Concept of accessibility
- Consistent reporting performance
- Client-server architecture
- Generic dimensionality
- Dynamic sparse matrix handling
- Multi-user support
- Unrestricted cross-dimensional operations
- Intuitive data manipulation
- Flexible reporting
- Unlimited dimensions and aggregation levels
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