单项选择题

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

A.temp files
B.online data files
C.offline data files
D.read only data files

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多项选择题

Which three statements are true about database recovery operations？（）

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

When performing an incomplete recover of the whole database， which data files must you restore？（）

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