Hardware Tuning:One-Minute Rule For sequentially accessed data,more pages can be read per second. Assuming sequential reads of 1MB of data at a time: 1-minute rule:sequentially accessed data that is accessed once or more in a minute should be kept in memory Prices of disk and memory have changed greatly over the years,but the ratios have not changed much So rules remain as 5 minute and 1 minute rules,not 1 hour or 1 second rules！ Database System Concepts-6th Edition 24.10 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 24.10 ©Silberschatz, Korth and Sudarshan th Edition Hardware Tuning: One-Minute Rule For sequentially accessed data, more pages can be read per second. Assuming sequential reads of 1MB of data at a time: 1-minute rule: sequentially accessed data that is accessed once or more in a minute should be kept in memory Prices of disk and memory have changed greatly over the years, but the ratios have not changed much So rules remain as 5 minute and 1 minute rules, not 1 hour or 1 second rules!