已知事务T1的封锁序列为:LOCKS (A)…LOCKS (B)…LOCKX (C) …UNLOCK (B)…UNLOCK (A)…UNLOCK (C) 事务T2的封锁序列为:LOCKS (A)…UNLOCK (A)…LOCKS (B) …LOCKX (C)…UNLOCK (C)…UNLOCK (B) 则遵守两段封锁协议的事务是()
A.T1 B.T2 C.T1 和 T2 D.没有正确答案A
已知事务T1的封锁序列为:LOCKS (A)…LOCKS (B)…LOCKX (C) …UNLOCK (B)…UNLOCK (A)…UNLOCK (C) 事务T2的封锁序列为:LOCKS (A)…UNLOCK (A)…LOCKS (B) …LOCKX (C)…UNLOCK (C)…UNLOCK (B) 则遵守两段封锁协议的事务是()
A.T1 B.T2 C.T1 和 T2 D.没有正确答案A