Understanding Buffer Pool Performance and ... - Quest Software

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Buffer Pool Management Buffer pools not used with all data types You Can Expect More • LONG VARCHAR, BLOB and CLOB retrieved directly from disk using non-buffered (direct) IO • Keeping large object pages out of buffer pools helps DB2 maintain effective caching for regular data types 1 GB BLOB 1 GB BP Disk Without use of direct IO, large data types would force DB2 to flush all resident pages to disk – ruining the hit rate
Buffer Pool Management You Can Expect More Creating/Altering Buffer Pools • IBMDEFAULTBP automatically created with each database • Additional buffer pools added with the CREATE BUFFERPOOL statement • SYSCTRL or SYSADM privileges are required to work with buffer pools CREATE BUFFERPOOL bufferpool_name SIZE number of pages [IMMEDIATE | DEFERRED] [PAGESIZE integer [K]] [[NOT] EXTENDED STORAGE | NUMBLOCKPAGES number of pages [BLOCKSIZE number of pages]] [ALL DBPARTITIONNUMS | DATABASE PARTITION GROUP db_partition_group_name [,…]] [EXCEPT ON DBPARTITIONNUM[S] (db_partition_number1 [TO db_partition_number2] SIZE number of 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 and 8: Buffer Pool Overview Tuning Goals
Page 9 and 10: Buffer Pool Overview Prefetch You C
Page 11: You Are Here - DB2 Process Model Li
Page 15 and 16: Buffer Pool Management You Can Expe
Page 17 and 18: 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 •

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