First there was the Easter bunny. Then the tooth fairy. Then there was the emperor who wore no clothes. Now we have bottom-up warehouse development, where the enterprise data warehouse is developed by first building a data mart.

The theory is that in bottom-up data warehouse development first one data mart is developed, then another data mart is developed, then one day--presto-- you magically and effortlessly wake up and have a data warehouse. While such a scenario appeals to the fantasy of those people who crave a quick fix without having to bother with the complexity, reality and investment that a real data warehouse requires, the truth is that bottom-up warehouse development is just a lot of wishful thinking. For a number of very good reasons, there is no substance behind bottom-up warehouse development.

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