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Author  Topic  umer_555 Starting Member 1 Post Posted - 2011-07-08 : 02:43:47 do u have any idea how to estimate data warehouse size from operational database size… for example if I have 20TB of data in operational source systems definitely all of this won’t be in ware house so is there any heuristic or something that it will one third of it or any other method to roughly estimate ????? Please guide me