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Carrie, Thanks for great info. In 14.10, Will optimizer do system sampling when System Threshold option (SysChangeThresholdOption = 0) and Usecount logging is turned on ? Should System Threshold option be disabled for optimizer to go with system sampling like how it does in 14.0 ? I ran few tests by enabling System Threshold option (SysChangeThresholdOption = 0) and Usecount logging and did not notice optimizer doing System Sampling.