Understanding Buffer Pool Performance and ... - Quest Software

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Buffer Pool Overview Basics and Terminology (cont’d) • Pages read into buffer pool from disk by: – Agents, using synchronous I/O – Prefetchers, using asynchronous I/O • Pages written to disk from buffer pool by: – Agents, using synchronous I/O – Page cleaners, using asynchronous I/O You Can Expect More
Buffer Pool Overview Tuning Goals • Recovery vs. Performance – Recovery wants everything on disk – Database manager wants everything in memory – Which goal is more important – largely depends on data – Which combination works best for both goals You Can Expect More • High hit ratio means logical reads usually successful, avoiding disk access • Normally want to maximize asynchronous I/O to minimize waits
Page 1 and 2: Understanding Buffer Pool Performan
Page 3 and 4: Introduction You Can Expect More Q:
Page 5: Buffer Pool Overview Basics and Ter
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 and 32: Evaluating Performance Metrics Phys
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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