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  3. A transaction is an action,or a series o

A transaction is an action,or a series o

资格题库2022-08-02  72
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（　　）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.问题1选项A.application developerB.all usersC.application programD.DBMS问题2选项A.IndivisibleB.permanentC.infrequentD.infinite问题3选项A.completedB.incompleteC.abortedD.committed问题4选项A.atomicityB.consistencyC.isolationD.durability问题5选项A.DBMSB.DBAC.end userD.DBS
选项
答案 CABBA
解析 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.
application developer,all users,application program,DBMS
事务是由单个用户或（）访问或更改数据库内容的动作或一系列动作。
应用开发人员，所有用户，应用程序，数据库管理系统
atomicity,the"all or nothing"property,A transaction is an(72)unit that is either performed in its entirety or is not performed at all.
indivisible,permanent,infrequent,infinite
原子性，“全或无”属性，事务是一个（）单位，要么整体执行，要么根本不执行。
不可分割的、永久的、罕见的、无限的。
isolation,transactions execute independently of one another.in other words,the partial effects of(73)transactions should not be visible to other transactions.
completed,incomplete,aborted,committed
隔离、事务彼此独立执行。换句话说，（）事务的部分效应不应该对其他事务可见。
完成，未完成，中止，提交。
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.
atomicity,consistency,isolation,durability.
DBMS,DBA,end user,DBS
上面的四个属性，只有（）属性是并发控制子系统的责任，以确保，（）和应用程序开发人员都有责任确保一致性。
原子性、一致性、隔离性、耐久性。
DBMS、DBA、终端用户、DBS。
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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

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