多项选择题
A.password file
B.online redo log files
C.the current control file
D.archived redo log files
E.the current server parameter file
F.all the data files belonging to the USERS tablespace
G.data files belonging to the USERS tablespace and all the default tablespaces
单项选择题 View the Exhibit. You executed the following command to perform a backup of the USERS tablespace： RMAN> BACKUP TABLESPACE USERS Which type of backup would this command perform？（）
单项选择题 You execute the following command to perform a backup by using Recovery Manager （RMAN）： RMAN> run {allocate channel c1 type sbt backup datafile 1 } The command errors out. A part of the error message is as follows： RMAN03009： failure of allocate command on c1 channel ORA19554： error allocating device， device type： SBT_TAPE， device name： What could explain why the statement failed？（）
单项选择题 You observe that the senior database administrator always uses the following command when connecting to Recovery Manager （RMAN）， and then starts executing commands to backup the database files： $ rman target / What would be the effect of this command？（）
