单项选择题
A.Only the damaged or lost data files.
B.All of the data files of the database.
C.Only the data files belonging to the SYSTEM tablespace.
D.The data files belonging to the SYSTEM tablespace and the damaged or lost data files.
单项选择题 You execute this command in MOUNT mode： ALTER DATABASE ARCHIVELOG； Where is the information that the database is now in ARCHIVELOG mode stored？（）
单项选择题 You are using RMAN to perform a closed database backup of your database. You issue these RMAN commands： STARTUP MOUNT； BACKUP FORMAT ’/BACKUP/df_%d_%s_%p.bus’ DATABASE filesperset = 2； Which components are included in the backup？（）
单项选择题 You want to create a copy of the DEPARTMENTS table. When that is complete， you want to truncate the new DEPARTMENTS table， then restore the data with a direct-load insert from the old DEPARTMENTS table. Which CREATE statement should you use？（）