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,5th Ed. 23.9 ©Silberschat乜，Korth and SudarshanDatabase System Concepts, 5 23.9 ©Silberschatz, Korth and Sudarshan th Ed. 9 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!