多项选择题 The persistent configuration settings for RMAN have default for all parameters.Identify four RMAN commands that produce a multi-section backup.（）

多项选择题 In your multitenant container database (CDB) containing same pluggable databases (PDBs), you execute the following commands in the root container: Which two statements are true?（）

多项选择题 You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）