多项选择题
A. MEMORY_TARGET can be increased up to the value of MEMORY_MAX_TARGET， if MEMORY_MAX_TARGET is set to a value greater than zero
B. MEMORY_MAX_TARGET defaults to a value of zero if MEMORY_TARGET is not set
C. MEMORY_TARGET represents the total amount of memory that can be allocated to SGA and PGA memory structures.
D. MEMORY_TARGET is static and cannot be modified without shutting down the instance
单项选择题 You have enabled backup optimization in RMAN. You issue the following RMAN command to configure a redundancy-based retention policy： CONFIGURE RETENTION POLICY TO REDUNDANCY 3； Which statement is true？（）
单项选择题 You perform a backup using the following BACKUP command： RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE； Which statement is true of this command？（）
单项选择题 Whichdependentobjectwillgetinvalidatedevenifitisnotaffectedbythetableedefinition？（）