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The Five Minute Rule, Ten Years Later
December 1, 1997
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Download Document
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BibTex
Authors
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Goetz Graefe

Jim Gray
Publication Type
TechReport
Number
P116

Abstract
Abstract
Simple economic and performance arguments sug-gest appropriate lifetimes for main memory
pages and suggest optimal page sizes. The fundamental tradeoffs are the prices and bandwidths
of RAMs and disks. The analysis indicates that with today’s tech-nology, five minutes is a good
lifetime for randomly accessed pages, one minute is a good lifetime for two-pass sequentially
accessed pages, and 16 KB is a good size for index pages. These rules-of-thumb change in
predictable ways as technology ratios change. They also motivate the importance of the new
Kaps, Maps, Scans, and /Kaps, /Maps, /TBscan metrics.
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