题目内容

若事务T在数据对象A上施加了S锁,则其他事务只能对数据A再加_________锁,不能加_________锁,直到事务T释放A上的封锁。

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数据库中多事务并发访问时,若两个或多个事务同时处在彼此相互等待的状态,则发生了________ 。

I took the wrong ________ at the last road junction, can you tell me how I get back on the motorway?

A. cross
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A. come
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I’m ________ for the town hall — am I anywhere near?

A. making
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C. seeing
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