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The total Db2 CPU time per transaction, which consists of the Db2 class 2 CPU time plus MSTR, DBM1, and IRLM CPU time per transaction for each migration scenario is shown in Figure 5-6. 

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Db2 12 at function level V12R1M100 benefits from many Db2 12 internal optimizations that are not available in older Db2 releases. At function level V12R1M500, Db2 shows more performance benefits because GBP-dependent index objects also become eligible for fast index traversal. 

After rebinding with APREUSE(NONE), we observed minor access path changes in several packages of the workload. However, Db2 accounting reports indicated similar getpage counts per occurrence for the packages with changed access paths. Also, class 7 CPU time was nearly identical for these packages. 

