Cost-Based Optimization of Integration Flows - Datenbanken ...

6 On-Demand Re-Optimization
(a) Loaded Data Size Variations
(b) Input Data Size Variations
(c) Optimization Time
(d) Execution Time
(e) Cumulative Optimization Time
(f) Cumulative Execution Time
Figure 6.15: Complex-Flow Comparison Scenario
default values, we used a number of workload shifts wc = 20, an input data size d = 4,
and an optimization interval of ∆t = 30 s. Figure 6.16 illustrates the results.
First, we varied the number of workload shifts wc ∈ [0, 30]. The unoptimized execution
shows almost constant execution time (Figure 6.16(a)) except the configuration
with no workload shifts because the plan is not optimal for the whole scenario, while for
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