设T1和T2两个事务，它们对数据A的并发操作如下表所示(SLOCKA表示对数据A上S

发布时间：2018-07-29 15:11 │ 来源：www.tikuol.com

题型：单项选择题

问题：

设T1和T2两个事务，它们对数据A的并发操作如下表所示(SLOCKA表示对数据A上S锁，UNLOCKA表示对数据A解锁)，对这个并发操作，下面说法正确的是______。

A．T1

B．T2

C．

①请求

SLOCKA

读A=18

②

③A=A+10写回A=28

COMMIT

UNLOCK A

④

D．

请求

SLOCKA

读A=18

写回A=28

COMMIT

UNLOCKA

考点：计算机等级考试数据库工程师计算机数据库工程师

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