(31) data effectively is crucial for success in today’s competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the (32) in hardware and software. (33) integration uses a base document that contains copies of other objects. (34) integration uses a base document that contains the current or most recent version of the source document it contains. (35) provides an overview of the program written in "plain" English, without the computer syntax.
(32)是()(31) data effectively is crucial for success in today’s competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the (32) in hardware and software. (33) integration uses a base document that contains copies of other objects. (34) integration uses a base document that contains the current or most recent version of the source document it contains. (35) provides an overview of the program written in "plain" English, without the computer syntax.
(31)处是()①请求
SLOCK data
读 data=20
②
③A=A+30 写回 A=50
COMMIT
UNLOCK data
④ 请求
SLOCK data
读data=20
写回data=50
COMMIT
UNLOCK data
A. 该操作部能重复读
B. 该操作符合完整性要求
C. 该操作的第①步中,事务T1应该申请X锁
D. 该操作的第②步中,事务T2不可能得到对data的锁
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