多项选择题
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.
多项选择题 You execute the following Recovery Manager （RMAN） commands in he following order： BACKUP VALIDATE DATABAE RECOVER CORRUPTION LIST； Which two tasks are performed by these commands？（）
单项选择题 You specify a nonzero value for the MEMORY_TARGET initialization parameter, but do not set thePGA_AGGREGATE_TARGET or the SGA_TARGET parameters. You restart your database instance.Which statement about the result is true?（）
单项选择题 Which background process of a database instance, using Automatic Storage Management (ASM), connects asa foreground process into the ASM instance?（）