The Five-Minute Rule Ten Years Later, and Other Computer Storage Rules of Thumb

Details The Five-Minute Rule Ten Years Later, and Other Computer Storage Rules of Thumb The Five-Minute Rule Ten Years Later, and Other Computer Storage Rules of Thumb

1998-09-02

arxiv.org/abs/cs/9809005v1

ACM SIGMOD Record 26(4): 63-68 (1997)

Computer Science

Databases

Original document at: http://research.microsoft.com/~gray/5_min_rule_SIGMOD.doc

Scientific paper

Simple economic and performance arguments suggest 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 technology, 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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