Understanding Buffer Pool Performance and ... - Quest Software

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Evaluating <strong>Performance</strong> Metrics Prefetch – Asynchronous vs. Synchronous I/O – Waiting is always bad You Can Expect More – Make DB2 read ahead for you as much as possible, given application mix Approach: – Evaluate prefetch ratio – Know the workload – Evaluate prefetcher configuration – Use block I/O
Evaluating <strong>Performance</strong> Metrics Prefetch Ratio PrefetchRatio = ⎛ ⎜ ⎝ async.pool.data.reads bp.logical.reads • Lower values = more synchronous • Higher values = more asynchronous • Are there enough defined? + + You Can Expect More async.pool.index.reads bp.index.logical.reads ⎞ ⎟* 100 ⎠
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 and 30: Evaluating Performance Metrics Data
Page 31: Evaluating Performance Metrics Phys
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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