单项选择题
Which of the following is a valid way of putting a tablespace named DAVE_TBS into hot backup mode？（）
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？（）
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
单项选择题 WhichisthecorrectcommandtoputthedatabaseinARCHIVELOGmode？（）