单项选择题

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；

A. Attempting to restore silver_copy will fail.
B. Attempting to restore gold_copy will fail.
C. Both backups will be available for restore without question.
D. Attempting to restore gold_copy may or may not succeed.
E. You will not be able to restore either gold_copy or silver_copy.

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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.