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Business Intelligence by Jerzy Surma

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Chapter 2

1. OLTP provides solutions for operational activities of a company, such as effective and safe data storage, transaction data reconstruction, updating of data, optimization of the access to the data, and concurrency control (Garcia-Molina, Ullman, & Widom, 1999).

2. Inmon (2005).

3. Garcia-Molina, Ullman, and Widom (2008).

4. See http://www.inmoncif.com/

5. Codd, Codd, and Salley (1993), p. 7.

6. This fact table is used here for purely illustrative purposes, as “Costs” represents a very high level of aggregation, which in practice does not exist at the level of a fact table.

7. This table with the dimension “Date” is used here for purely illustrative purposes, as the lowest level of representation of time at the level of a month does ...

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