WCS和UCS的关系是()。
A、WCS和UCS是一个概念
B、WCS是绝对的,UCS是用户定义的
C、WCS包含UCS
D、UCS包含WCS
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一台微机共有32MB内存,则其高内存区的内存为()
A、640KB
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You work as a database administrator for Supportcenter.cn. Client connection requests are failing because the listener is not responding. You want to forward client connect requests to another listener if one listener is not responding. How do you achieve this?()
A、Enable instance failover
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D、Enable connect-time failover
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Which two statements about Flashback Query are true?()
AIt is generated by using the redo log files.
BIt helps in row-level recovery from user errors.
CIt can be performed to recover ALTER TABLE statements
DIt fails when undo data pertaining to the transaction is overwritten.
EThe database has to be opened with the resetlogs option after performing Flashback Query.
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设循环队列的存储空间为Q(1:35),初始状态为front=rear=35。现经过一系列入队与退队运算后,front=15,rear=15,则循环队列的元素个数为( )。
A、15
B、16
C、20
D、0或35