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【单选题】
A database instance is using an Automatic Storage Management (ASM) instance, which has a disk group, DGROUP1, created as follows: SQL> CREATE DISKGROUP dgroup1 NORMAL REDUNDANCY FAILGROUP controller1 DISK '/devices/diska1', '/devices/diska2' FAILGROUP controller2 DISK '/devices/diskb1', '/devices/diskb2' ; What happens when the whole CONTROLLER1 Failure group is damaged?（）A.
The transactions that use the disk group will halt.
B.
The mirroring of allocation units occurs within the CONTROLLER2 failure group.
C.
The data in the CONTROLLER1 failure group is shifted to the CONTROLLER2 failure group and implicit rebalancing is triggered.
D.
The ASM does not mirror any data and newly allocated primary allocation units (AU) are stored in the CONTROLLER2 failure group.
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【简答题】要使窗体上的按钮运行时不可见,需要设置的属性是( )。
【简答题】要使窗体上的按钮运行时不可见,需要设置的属性是( )。
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