Understanding Buffer Pool Performance and ... - Quest Software

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Buffer Pool Overview You Can Expect More Page Cleaners • Two main goals – Ensure that agents reading a page into the buffer pool never need to first flush a dirty page to disk to free up a slot – Speed recovery time by reducing # log files needed • Configuration parameters – num_iocleaners – number of page cleaners for a database – chngpgs_thresh – percentage of changed pages at which the page cleaners will be started, if not currently active • Alternate page cleaning (8.1.4 and later) – List of “good victim pages” (dirty pages just written out) kept, prevents searching in many cases – LSN gaps anticipated, prevents I/O spikes – chngpgs_thresh is ignored
You Are Here – DB2 Process Model Listener Client Application Coordinator Subagents Prefetchers Buffer Pool Logger You Can Expect More External Storage Page Cleaners Log
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: Buffer Pool Overview Prefetch You C
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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