多选题Which three statements are true about adaptive SQL plan management?（）AIt automatically performs verification or evolves non-accepted plans, in COMPREHENSIVE mode when they perform better than existing accepted plans.BThe optimizer always uses the fixed
题目
多选题
Which three statements are true about adaptive SQL plan management?（）
A
It automatically performs verification or evolves non-accepted plans, in COMPREHENSIVE mode when they perform better than existing accepted plans.
B
The optimizer always uses the fixed plan, if the fixed plan exists in the plan baseline.
C
It adds new, bettor plans automatically as fixed plans to the baseline.
D
The non-accepted plans are automatically accepted and become usable by the optimizer if they perform better than the existing accepted plans.
E
The non-accepted plans in a SQL plan baseline are automatically evolved, in COMPREHENSIVE mode, during the nightly maintenance window and a persistent verification report is generated.