单项选择题
A. Enable supplemental logging for the database.
B. Specify undo retention guarantee for the database
C. Create Flashback Data Archive in the tablespace where the tables are stored.
D. Create Flashback Data Archive and enable Flashback Data Archive for specific tables
单项选择题 Your database is running in ARCHIVELOG mode， and the database is open. You execute an RMAN backup and specify the KEEP clause. Which components are backed up when this option is specified？（）
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.)