Data Management: What is Abstraction?

"Abstraction" is a term that gets thrown around a lot these days in data management, but I for one have had a lot of difficulty understanding what people mean by it. Usually it is not worthwhile interrupting valuable conversations on design and architecture to have a discussion on what someone means by "abstraction.” Such a tangential debate is unlikely to help solve the practical problem at hand and will probably waste a good deal of time.  However, there comes a point when it is necessary to understand what "abstraction" really means, and particularly if its definition has significance for design or architectural patterns.

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