Understanding Buffer Pool Performance and ... - Quest Software

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Buffer Pool Overview You Can Expect More Prefetchers and Page Cleaners • DB2 uses prefetch and page cleaner processes to reduce the time that agents have to wait for IO operations to complete • New in 8.1.4: Proactive Page Cleaning, AKA Alternate Page Cleaning – DB2_USE_ALTERNATE_PAGE_CLEANING=ON
Buffer Pool Overview Prefetch You Can Expect More • Prefetchers try to ensure that agents doing tablespace scans never wait for disk I/O • Agents send asynchronous read-ahead request to common prefetch queue • Prefetchers service the request by bringing the requested pages into the buffer pool • Should result in logical read, drive hit rate up • Two types: – List prefetch, efficiently reads a set of non-consecutive data pages – Sequential prefetch, reads consecutive pages
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: Buffer Pool Overview Tuning Goals
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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