Optimizing SQL Insert Performance - GSE Belux

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Space search steps (Classic Segmented/UTS in V9) Search the space map page that contains lowest segment has free space to the end of space map page 2 Search adjacent pages within the segment 2 3 End 4 Search the end Without physical extend Search the end with Extend 1 5 Search from lowest segment that has free space 5 Extend failed 6 Exhaustive search from the beginning of table space © 2010 IBM Corporation
PBG search algorithm for entire table space Part 1 Part 2 part 3 part 4 Thread 1 Thread 2 Thread 3 Thread 4 T1 T2 T3 T4 Insert to Part 3 Insert to Part 3 Insert to Part 2 Insert to Part 3 © 2010 IBM Corporation
Page 1 and 2: DB2 for z/OS Optimizing Insert Perf
Page 3 and 4: Agenda • Insert Space Search •
Page 5 and 6: Choice: Performance or Space Reuse
Page 7: Space Search Steps (Classic Partiti
Page 11 and 12: Segmented Tablespace • Segmented
Page 13 and 14: Partitioned Tablespace • Use page
Page 15 and 16: Distributed Free Space • Use dist
Page 17 and 18: TRACKMOD NO • Reduces spacemap co
Page 19 and 20: MEMBER CLUSTER … • Rows inserte
Page 21 and 22: MEMBER CLUSTER, PCTFREE = 0 and FRE
Page 23 and 24: Typical Performance Bottlenecks and
Page 25 and 26: Read and Write I/O for Index and Da
Page 27 and 28: Read and Write I/O for Index and Da
Page 29 and 30: Lock/Latch and Service Task Waits
Page 31 and 32: DB2 Latch Contention • Latch Coun
Page 33 and 34: GENERATE_UNIQUE() • Built-in func
Page 35 and 36: DB2 9 Performance Enhancements 35
Page 37 and 38: Large Index Page Size • Available
Page 39 and 40: Increased Index Look Aside • Prio
Page 41 and 42: Randomised Index Key • Index cont
Page 43 and 44: Identifying Unreferenced Indexes
Page 45 and 46: DB2 10 Performance Enhancements 45
Page 47 and 48: V10 Enhancements ... • In-line LO
Page 49 and 50: Summary - Key Points • Decide whe

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