Which files must be synchronized in order for a database to start？（）

多项选择题Whichthreestatementsaretrueaboutdatabaserecoveryoperations？（）

A.Damaged or lost data files are restored from backups.
B.Redo log file entries are used to roll forward the database.
C.Undo segments are used to roll back any uncommitted transactions.
D.Transactions that were active when the failure occurred are restarted.
E.Transactions that were active when the failure occurred are automatically committed during the recover procedure.

单项选择题Whenperforminganincompleterecoverofthewholedatabase，whichdatafilesmustyourestore？（）

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？（）

A.SPFILE
B.archive log
C.control file
D.system tablespace

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？（）

A.Only the data files.
B.Only the data files and the online logs.
C.The data files， control files， and the online logs.
D.The data files and control files， but not the online logs.

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？（）

A.A
B.B
C.C
D.D