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There are so many methods on the market that could measure or estimate different aspects of information system. When the information system is finished and it is in use for some time, redesigning of the existing one or making a new one has to be done. To make estimation of investment as precise as possible, and to manage development and implementation of the new information system, there is a need for measuring or estimation a complexity of the existing information system. Information system complexity measuring methods shows correct complexity measure, but their enforcement is very hard and slow. This paper represents method called SBP (Database Complexity). SBP can very fast obtain a measure of database complexity.