The Five Minute Rule Still Stands
Jul. 6, 2009 11:34 in
General Technology
First coined in 1987, even the Moore’s law march of time hasn’t undermined the rule.
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 break-even interval between accesses. If a record (or page) is accessed more often, it should be kept in memory; otherwise, it should remain on disk and be read when needed.
It’s still more or less true today.
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