OCP-1Z0-053-V12.02-124题
2013-10-24 20:26
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124.You are managing Oracle Database 11g with an ASM storage with high redundancy. The following
command was issued to drop the disks from the dga disk group after five hours:
ALTER DISKGROUP dga OFFLINE DISKS IN FAILGROUP f2 DROP AFTER 5H;
Which statement is true in this scenario?
A. It starts the ASM fast mirror resync.
B. All the disks in the dga disk group would be OFFLINE and the DISK_REPAIR_TIME disk attribute
would be set to 5 hours.
C. It drops all disk paths from the dga disk group.
D. All the disks in the dga disk group in failure group f2 would be OFFLINE and the DISK_REPAIR_TIME
disk attribute would be set to 5 hours.
Answer: D
答案解析:
参考:http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_1007.htm#BABEJJID
disk_offline_clause
Use the
taking the specified disks offline.
Specify
The
By default, Oracle ASM drops a disk shortly after it is taken offline. You can delay this operation by specifying the
can specify the timeout value in units of minute or hour. If you omit the unit, then the default is hour.
You can change the timeout period by specifying this clause multiple times. Each time you specify it, Oracle ASM measures the time from the most recent previous
To learn how much time remains before Oracle ASM will drop an offline disk, query the
This clause overrides any previous setting of the
command was issued to drop the disks from the dga disk group after five hours:
ALTER DISKGROUP dga OFFLINE DISKS IN FAILGROUP f2 DROP AFTER 5H;
Which statement is true in this scenario?
A. It starts the ASM fast mirror resync.
B. All the disks in the dga disk group would be OFFLINE and the DISK_REPAIR_TIME disk attribute
would be set to 5 hours.
C. It drops all disk paths from the dga disk group.
D. All the disks in the dga disk group in failure group f2 would be OFFLINE and the DISK_REPAIR_TIME
disk attribute would be set to 5 hours.
Answer: D
答案解析:
参考:http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_1007.htm#BABEJJID
disk_offline_clause
Use the
disk_offline_clauseto take one or more disks offline. This clause fails if the redundancy level of the disk group would be violated by
taking the specified disks offline.
Specify
disk_nameas shown in the
NAMEcolumn of the
V$ASM_DISKdynamic performance view.
The
QUORUMand
REGULARkeywords have the same semantics here as they have when adding a disk to a disk group.
By default, Oracle ASM drops a disk shortly after it is taken offline. You can delay this operation by specifying the
timeout_clause, which gives you the opportunity to repair the disk and bring it back online. You
can specify the timeout value in units of minute or hour. If you omit the unit, then the default is hour.
You can change the timeout period by specifying this clause multiple times. Each time you specify it, Oracle ASM measures the time from the most recent previous
disk_offline_clausewhile the disk group is mounted.
To learn how much time remains before Oracle ASM will drop an offline disk, query the
repair_timercolumn of
V$ASM_DISK.
This clause overrides any previous setting of the
disk_repair_timeattribute.
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