Which of the following is a valid way of putting a tablespace named DAVE_TBS into hot backup mode？（）  

单项选择题Whichcommandwillresultinatracefilebeingcreatedwiththecreatecontrolfilecommandcontainedinit？（）

A. alter database backup controlfile
B. alter database backup controlfile to trace
C. alter database controlfile backup
D. alter database controlfile backup to ’/ora01/oracle/ctrl_backup.ctl’
E. alter database begin controlfile backup

单项选择题What is the correct order of steps to perform an online database backup？（）   a. alter database begin backup b. alter database end backup c. Back up the database datafiles d. Back up the archive log files e. alter system switch logfile

A.a， b， c， d， e
B.e， d， a， b， c
C.a， c， b， d， e
D.d， b， c， a， e
E.a， c， b， e， d

单项选择题WhichisthecorrectcommandtoputthedatabaseinARCHIVELOGmode？（）

A. alter database archivelog
B. alter system enable archivelog mode
C. alter database enable archive
D. alter database archivelog enable
E. None of the above

多项选择题WhatarethedifferentloggingmodesavailableinOracleDatabase11g？（）

A. NOLOG mode
B. NOARCHIVELOG mode
C. LOGGING mode
D. HOTDATABASE mode
E. ARCHIVELOG mode

单项选择题You backed up the database at 8 a.m. today using an online backup. Accounting made a large change to the underlying data between 10 a.m. and noon.  Which of the following actions would ensure that the changes could be recovered using the 8 a.m. backup？（）

A. Create a manual incremental online database backup.
B. Back up all the archived redo logs generated since the 8 a.m. backup.
C. Create a brand-new backup after all the changes have been applied.
D. There is no way to make the changes recoverable based on the 8 a.m. backup.
E. Perform an online backup of the tablespace（s） that contained changed data.