What is the end result of these commands if they are successful？（）  
RMAN> show retention policy； 
RMAN configuration parameters for database with db_unique_name 
ORCL are： CONFIGURE RETENTION POLICY TO REDUNDANCY 1； # default
Backup database tag=gold_copy plus archivelog tag=gold_copy delete input； Backup 
database tag=silver_copy plus archivelog tag=silver_copy delete input；  

多项选择题Which three statements about performance analysis by SQL Performance Analyzer are true? （）(Choose three.)

A. It detects changes in SQL execution plans.
B. It produces results that can be used to create the SQL plan baseline.
C. The importance of SQL statements is based on the size of the objects accessed.
D. It generates recommendations to run SQL Tuning Advisor to tune regressed SQLs.
E. It shows only the overall impact on workload and not the net SQL impact on workload.

多项选择题When executing a SQL workload, you choose to generate execution plans only, without collecting execution statistics. Which two statements describe the implications of this? （）(Choose two.)

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.