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？（）
A.sbt is not a valid device type.
B.Media Management Library was not loaded.
C.The sbt device cannot be used for data file backups.
D.No path was defined in the ALLOCATE CHANNEL command.
E.The channel is currently being used by another RMAN session.
相关考题
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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？（）
A.RMAN would use the current operating system location to place the backup.
B.RMAN would use the control file of the target database to maintain the backup.
C.RMAN would use the recovery catalog of the target database to maintain the backup.
D.RMAN would use the control file of the target database to maintain the backup metadata.
E.RMAN would use the recovery catalog of the target database to maintain the backup metadata. -
单项选择题
In Recovery Manager （RMAN）， you set the retention policy to NONE by executing the following command： CONFIGURE RETENTION POLICY TO NONE What would be the impact of this setting？（）
A.The retention policy is cleared.
B.RMAN does not consider any backup as obsolete.
C.The retention policy is set to its default setting of redundancy 1.
D.The retention policy is set to its default setting of recovery window 7. -
多项选择题
In Recovery Manager （RMAN）， you have set control file autobackup to ON by using the following command： CONFIGURE CONTROLFILE AUTOBACKUP ON Which two events would cause the control file to be backed up automatically？ （）
A.a tablespace is taken offline
B.the database instance is restarted
C.a new data file is added to an existing tablespace
D.a successful backup is recorded in the RMAN repository
E.the RMAN connection is disconnected from the target database
