Understanding Buffer Pool Performance and ... - Quest Software

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Evaluating Performance Metrics Index Hit Rate – Includes all index reads by buffer pool Bufferpool IHR = ⎛ ⎜ ⎝ – Low values = more physical IO – High values = more logical IO – 85 – 90% is a good starting point You Can Expect More bp. index. logical . reads bp. index. logical . reads + bp. index. physical . reads ⎞ ⎟ * 100 ⎠
Evaluating Performance Metrics Physical IO Read Rate PhysicalIOReads = ⎛ bufferpool. data. logical. reads + bufferpool. data. ⎜ ⎝ total. collection. time You Can Expect More • Total number of physical reads by buffer pool over time • Use: GET SNAPSHOT FOR TABLESPACES ON database_name • Could indicate the need for… – Additional containers – Buffer pool breakout physical. reads ⎞ ⎟ ⎠
Page 1 and 2: Understanding Buffer Pool Performan
Page 3 and 4: Introduction You Can Expect More Q:
Page 5 and 6: Buffer Pool Overview Basics and Ter
Page 7 and 8: Buffer Pool Overview Tuning Goals
Page 9 and 10: Buffer Pool Overview Prefetch You C
Page 11 and 12: You Are Here - DB2 Process Model Li
Page 13 and 14: Buffer Pool Management You Can Expe
Page 19 and 20: Collecting Performance Metrics Tuni
Page 21 and 22: Collecting Performance Metrics DB2
Page 23 and 24: Collecting Performance Metrics •
Page 25 and 26: Collecting Performance Metrics •
Page 27 and 28: Evaluating Performance Metrics You
Page 29: Evaluating Performance Metrics Data
Page 33 and 34: Evaluating Performance Metrics Pref
Page 35 and 36: Evaluating Performance Metrics Eval
Page 37 and 38: Evaluating Performance Metrics TCR
Page 39 and 40: Conclusion You Can Expect More •

Understanding Buffer Pool Performance and ... - Quest Software

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