The Five-Minute Rule 20 Years Later – Communications of the ACMIn 1987, Jim Gray and Gianfranco Putzolu published their now-famous five-minute rule15 for trading off memory and I/O capacity. Their calculation compares the cost of holding a record (or page) permanently in memory with the cost of performing disk I/O each time the record (or page) is accessed, using appropriate fractional prices of RAM chips and disk drives. The name of their rule refers to the
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