ALTER DISKGROUP data MOUNT RESTRICT;
What is the implication of this command?
A. The client RDBMS instance can access the file as a read-only file.
B. A new disk cannot be added to a disk group.
C. A disk in a disk group can be taken offline.
D. The client RDBMS instance cannot access the files in the disk group.
答案：（D）
解析：
RESTRICTED | NORMAL, 使用这个子句决定磁盘组被加载的方式.
RESTRICTED, 磁盘组会以单实例排它模式被mount,这样同一集群的其它ASM实例不能mount该磁盘组.
磁盘组不能被任何ASM客户端所使用
NORMAL, 磁盘组以shared模式被mount,这样其它的ASM实例和客户端可以访问该磁盘组.