首页
登录
从业资格
A transaction is an action, or a series
A transaction is an action, or a series
免费题库
2022-08-02
37
问题
A transaction is an action, or a series of actions, carried out by a single user or( ), that accesses or changes the contents of the database.A transaction should possess the four basic or so-called ACID properties: Atomicity. The “all or nothing” property. A transaction is an ( )unit that is either performed in its entirety or is not performed at all. Consistency. A transaction must transform the database from one consistent state to another consistent state. Isolation. Transactions execute independently of one another. In other words, the partial effects of(请作答此空)transactions should not be visible to other transactions. Durability. The effects of a successfully completed (committed)transaction are permanently recorded in the database and must not be lost because of a subsequent failure.The four properties above,only( )property is the responsibility of the concurrency control subsystem to ensure. It is the responsibility of both the( )and the application developers to ensure consistency. To guarantee the Atomicity and Durability properties after a failure, a log file is needed.A.completedB.incompleteC.abortedD.committed
选项
答案
B
解析
转载请注明原文地址:https://tihaiku.com/congyezige/2418663.html
本试题收录于:
中级 数据库系统工程师题库软件水平考试初中高级分类
中级 数据库系统工程师
软件水平考试初中高级
相关试题推荐
InClanguage,a()isaseriesofcharact
______occurswhenaseriesofsynchroni
______occurswhenaseriesofsynchroni
用于提交和回滚事务的语句为( )。A.ENDTRANSACTION和ROLL
Atransactionisanaction,oraserieso
用于提交和回滚事务的语句为()。A.ENDTRANSACTION和ROLL
Atransactionisanaction,oraseries
Atransactionisanaction,oraseries
Atransactionisanaction,oraserieso
计划(Plan)、执行(Do)、()和行动(Action),简称PDCA。A.
随机试题
Ifyourpurchaseisnotasdescribedorisoflowquality,youcanreturnth
( )是每个旅游从业人员必须具备的首要条件。A.讲究职业道德 B.敬业、精业
?根据《担保法》的规定,可以质押的权利包括( )。A.依法可以转让的股份、股票
济川煎的组成药物中含有A:麦冬B:当归C:生地黄D:玄参E:白芍
A.双方冲突型 B.指导-合作型 C.共同参与型 D.患者主导型 E.主
地上16层、地下1层的现浇钢筋混凝土框架-剪力墙办公楼,如图所示。房屋高度为6
下列说法错误的是()。A.贵州省境内石灰岩分布广泛,地质灾害频繁 B.
以下关于重新购建成本的说法中,正确的有()。A:重新购建成本可以细分为重建成本和
统计数据按照收集方法不同,通过直接调查或测量而收集到的数据称为()。A.实
航道整治爆破工程,()必须经过专业培训和考核,并应取得相应资格持证上岗。A.技
最新回复
(
0
)