单项选择题
A. The ORACLE_BASE base parameter is not set.
B. The installation is being performed by the root user.
C. The operating system group that is specified should have the root user as its member.
D. The operating system group that is specified must have permission to write to the inventory directory
多项选择题 Which two statements are true about the RMAN validate database command?（）
多项选择题 Identify three scenarios in which you would recommend the use of SQL Performance Analyzer to analyzeimpact on the performance of SQL statements.（）
单项选择题 Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN. You want to issue the following RMAN command: RMAN > BACKUP TABLESPACE hr_pdb:userdata; Which task should you perform before issuing the command?（）