Archived redo logs can be copied to more than one destination by Oracle.（）

单项选择题Whichisnotavalidwayofbackingupacontrolfile？（）

A. Backing up the control file to trace
B. Copying the existing control file of the database to the backup location during a hot backup 
C. Copying the existing control file of the database to the backup location during a cold backup
D. Creating a backup control file
E. Using the create controlfile command

单项选择题EverySundaytheUnixsystemadministratorhasajobthatexecutesafullbackupoftheentireUnixsystemyourdatabaseison.Isthisbackupusableforbackupandrecoveryofyourdatabase？（）

A. Yes， if the database is in ARCHIVELOG mode
B. Yes， if the database is in NOARCHIVELOG mode
C. No， the backup is not usable in any way
D. Only if the ENABLE_ONLINE_BACKUP parameter is set to TRUE

单项选择题WhichofthefollowingisavalidwayofputtingatablespacenamedDAVE_TBSintohotbackupmode？（）

A. alter tablespace DAVE_TBS backup mode
B. alter tablespace DAVE_TBS start backup
C. alter tablespace DAVE_TBS begin backup
D. alter tablespace DAVE_TBS backup begin
E. alter tablespace DAVE_TBS backup

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