题目内容
数据库管理系统采用三级加锁协议来防止并发操作可能导致的数据错误。在三级加锁协议中，一级加锁协议能够解决的问题是______。
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事务T对数据对象A加上何种锁，其他事务只能再加对A加S锁，不能加X锁，直到事务T释放A上的S锁为止______
某系统中事务T1从账户A转出资金到账户B中，在此事务执行过程中，另一事务T2要进行所有账户金额统计操作。在T1和T2事务成功提交后，数据库服务器突然掉电重启。为了保证T2事务统计结果及重启后A，B两账户金额正确，需利用到的事务性质分别是______。
Topic: Will petty criminals get light punishment Questions for Reference: 1. A new prosecution guideline was recently released: people convicted of petty crimes may get light punishment if they are minors, the elderly people, and people who have slightly breached the law because of poverty. What do you think of this new law 2. This new law is said to be a humane practice and it will help them put their lives back in order and better serve their families. Do you think it can achieve its end 3. Some people think that if petty crimes are not punished in a timely way, more serious consequences will follow. What do you think of this argument
死锁是数据库系统中可能出现的一种状态。下列有关死锁的说法错误的是______。
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