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数据库两段封锁协议能解决脏读么？

in Technique[技术] by (71.8m points)

数据库中的两段封锁协议的规则是先加锁，后解锁，所以可以保证冲突可串行化，来保证并发的一致性。
但是两段封锁协议并不满足一级协议（即在事务commit时释放锁）。如果：事务1 修改数据A和B, 事务2 修改数据B. 事务1先获取A和B的锁，修改A的值，然后释放A的锁。在事务2获取A的锁的同时，如果事务1修改B失败，要进行roll back, 会发生什么？事务2 是否对A数据脏读？


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