单项选择题
A. only the control file， the current SPFILE， and data files
B. only the current SPFILE and data files if autobackup is disabled
C. only the data files and the archived redo logs
D. the control file，current SPFILE file，data files，and archived redo logs
多项选择题 Which are the two prerequisites before setting up Flashback Data Archive? （）(Choose two.)
多项选择题 You have enabled backup optimization for the RMAN environment. Identify two criteria on which RMAN will skip the file, if it has already been backed up.（） (Choose two.)
多项选择题 The ORACLE_SID environment variable is set to +ASM. ASMLIB is not used in the configuration. You executed the following command to startup the Automatic Storage Management （ASM） instance. SQL> STARTUP； Which two activities are performed during a successful start up operation？（）