单项选择题
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
单项选择题 WhichisthecorrectcommandtoputthedatabaseinARCHIVELOGmode？（）
多项选择题 WhatarethedifferentloggingmodesavailableinOracleDatabase11g？（）