半个小时候考完了.PASS.
下面这题没见过,我也选择错误了.

8. 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:
RMAN-03009: failure of allocate command on c1 channel
ORA-19554: 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.
Answer:B


在以下URL找到的题目.
http://blog.oracle.com.cn/html/57/t-137257.html

这个问题，如果你是一个真正的管理员的话，很好回答。sbt是rman里面留给外部存储介质管理的接口，如果想用磁带机，就需要由相应的磁带机管理软件来被rman调用。例如，如果用veritas nbu来做oracle的备份，在安装时，就会在oracle目录下生成一个.so文件，这就是veritas的介质管理软件，也就是sbt所引用的东西。

的确,题库里没有,但是不难~~

这个题目我看过。

我看的是testinside的题库，里面有这道题，好象是选B。

这道题选择D,我考试时就是选择的D,所以100%过了.

D是不对的吧

看到这个错误号,ORA-19554: error allocating device, device type: SBT_TAPE, device name:
想,是否为device 错误呢,
本来也想选择D ,因为有RMAN-03009 的错误.