【单选题】【消耗次数：1】
数据库的故障是指从保护安全的角度出发，数据库系统中会发生的各种故障。这些故障主要包括：（ ）、系统故障、介质故障和计算机病毒与黑客
①
丢失修改故障
②
不能重复读故障
③
事务内部的故障
④
不正确数据读出故障
参考答案：
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相关题目
【简答题】
影响数据库安全的因素主要有事务内部的故障、[填空]、介质故障和计算机病毒。
【简答题】
在常见的数据库故障类型中，由于天气原因造成磁盘意外损坏的数据库系统故障属于[填空1]。
【多选题】
系统故障的恢复描述正确的包括（ ）。
①
反向扫描日志，找出在故障发生前已经提交的事务将其加入REDO-LIST，同时找出故障发生时尚未完成的事务将其加入UNDO-LIST
②
对UNDO-LIST中的各个事务执行撤销处理
③
对REDO-LIST中的各个事务执行重做处理
④
正向扫描日志，找出在故障发生前已经提交的事务将其加入REDO-LIST，同时找出故障发生时尚未完成的事务将其加入UNDO-LIST
【简答题】
数据库故障有什么种类，有哪些恢复技术？
【多选题】
空调机组故障是指空调机组失去制冷功能，不能制冷，下列故障中哪些故障发生时空调机组不能制冷（）。
①
A.一个通风机故障
②
B.或一个冷凝风机故障
③
C.或一个压缩机故障
④
D.或两个压缩机同时故障
随机题目
【单选题】
The back garden of our house contains a lawn,
____ very pleasant to sit on in summer.
①
which is
②
which it is
③
it is
④
where it is
【单选题】
—Can you take the day off tomorrow?
—Well, I’ll have to get ____ from my boss.
①
permission
②
permit
③
allowance
④
possession
【单选题】
The house is made of wood and straw, and____to collapse
in a heavy storm.
①
reliable
②
liable
③
easy
④
probable
【单选题】
____ the water left in the kettle, the doctor put several things he unwrapped from a handkerchief.
①
At
②
To
③
Within
④
Into
【单选题】
After ____ seemed an endless wait, it was her turn to step into the doctor’s office.
①
it
②
that
③
what
④
which
【单选题】
He wrote the book in ____ with his wife.
①
proportion
②
installment
③
correspondence
④
collaboration
【单选题】
His decision was ____, since he could not see the action
from where he was standing.
①
arbitrary
②
ordinary
③
casual
④
accurate
【单选题】
Operations which left patients ____ and in need
of long periods of recovery time now leave them
feeling relaxed and comfortable.
①
exhausted
②
unhealthy
③
upset
④
fearful
【单选题】
Mother told Rose to buy some sugar in the supermarket
and_____.
①
she did so
②
so she did
③
so did she
④
she did such
【单选题】
The bank is reported in the local newspaper ____ in broad daylight yesterday.
①
to be robbed
②
robbed
③
to have been robbed
④
having been robbed