（多选题）
When executing a SQL workload，you choose to generate execution plans only， without collecting execution statistics. Which two statements describe the implications of this？（）
A It produces less accurate results of the comparison analysis.
B It automatically calls the SQL Tuning Advisor for recommendations.
C It shortens the time of execution and reduces the impact on system resources.
D Only the changes in the execution plan，and not performance regression，are detected.
正确答案
答案解析
略
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