更多“事务的性质:()(Atomicity)、()(Consistency)、()(Isolation)、()(Durability)。”相关问题
  • 第1题:

    事务的ACID特性中C的含义是( )。A.一致性(Consistency)B.临近性(Contiguity)C.连续性(continuity)D.并发性(Concurrency)


    正确答案:A
    ACID,指数据库事务正确执行的四个基本要素的缩写.包含:原子性(Atomicity)、一致性(Consistency)、隔离性(Isolation)、持久性(Durability)。

  • 第2题:

    在数据库加锁技术中,一个事务如果对某一数据项加了排它(exclusive)锁,它将保持此锁直到该事务结束。这是保证事务______特性。

    A.原子性(atomicity)

    B.一致性或可串行性(consistency or serializability)

    C.永久性(durability)

    D.隔离性(isolaty)


    正确答案:D

  • 第3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(请作答此空)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.atomicity
    B.consistency
    C.isolation
    D.durability

    答案:B
    解析:

  • 第4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.completed
    B.incomplete
    C.aborted
    D.committed

    答案:B
    解析:

  • 第5题:

    在数据库加锁技术中,一个事务如果对某一数据项加了排他(exclusive)锁,它将保持此锁直到该事务结束。这是保证事务哪种特性的重要措施()。

    A.原子性(atomicity)
    B.一致性或可串行性
    C.永久性(durability)
    D.隔离性(isolaty)

    答案:B
    解析:
    事务在系统完整性中实施一致性,这通过保证系统的任何事务最后都处于有效状态来实现。如果事务成功地完成,那么系统中所有变化将正确地应用,系统处于有效状态。如果在事务中出现错误,那么系统中的所有变化将自动地回滚,系统返回到原始状态。

  • 第6题:

    事务有(),这四个性质统称为事务的ACID性质。


    正确答案:原子性(automicity)、一致性(consistency)、隔离性(isolation)、持续性(durability)

  • 第7题:

    事务的特性有()

    • A、原子性(Atomicity)
    • B、一致性(ConsistemL)
    • C、隔离性(Isolation)
    • D、可生存性(Survivability)
    • E、持续性(Durability)

    正确答案:A,B,C,E

  • 第8题:

    机关事务和事务活动的本质特征在于它的()

    • A、政治性质
    • B、服务性质
    • C、决策性质
    • D、控制性质

    正确答案:B

  • 第9题:

    Full Atomicity, Consistency, Isolation, Durability (ACID) compliance is a necessity for a new application, which heavily reads and writes data. This requires the following config file options: Sync_binlog=1 Innodb_flush_log_at_trx_commit=1 Innodb_doublewrite=1 However, this configuration is expected to introduce disk I/O overhead. What three changes will reduce disk I/O overheads?()

    • A、Use of soft links for database directories on the same physical disk
    • B、Use of delay_key_write=ON for batch index update
    • C、Allocation of RAM to the buffer pool such that more of the data can fit in RAM
    • D、Placement of InnoDB log files and datadir on separate physical disks
    • E、Use of separate directories on the same physical disk for log files and data files

    正确答案:B,C,D

  • 第10题:

    单选题
    机关事务和事务活动的本质特征在于它的()
    A

    政治性质

    B

    服务性质

    C

    决策性质

    D

    控制性质


    正确答案: D
    解析: 暂无解析

  • 第11题:

    多选题
    Full Atomicity, Consistency, Isolation, Durability (ACID) compliance is a necessity for a new application, which heavily reads and writes data. This requires the following config file options: Sync_binlog=1 Innodb_flush_log_at_trx_commit=1 Innodb_doublewrite=1 However, this configuration is expected to introduce disk I/O overhead. What three changes will reduce disk I/O overheads?()
    A

    Use of soft links for database directories on the same physical disk

    B

    Use of delay_key_write=ON for batch index update

    C

    Allocation of RAM to the buffer pool such that more of the data can fit in RAM

    D

    Placement of InnoDB log files and datadir on separate physical disks

    E

    Use of separate directories on the same physical disk for log files and data files


    正确答案: D,E
    解析: 暂无解析

  • 第12题:

    填空题
    事务有(),这四个性质统称为事务的ACID性质。

    正确答案: 原子性(automicity)、一致性(consistency)、隔离性(isolation)、持续性(durability)
    解析: 暂无解析

  • 第13题:

    事务的ACID性质中,关于原子性(atomicity)的描述正确的是(1)。

    A.指数据库的内容不出现矛盾的状态。

    B.若事务正常结束,即使发生故障,更新结果也不会从数据库中消失。

    C.事务中的所有操作要么都执行,要么都不执行。

    D.若多个事务同时进行,与顺序实现的处理结果是一致的。


    正确答案:C
    解析:数据库管理系统运行的基本工作单位是事务,事务是用户定义的一个数据库操作序列,这些操作序列要么全做,要么全不做,是一个不可分割的工作单位。事务具有以下特性。(1)原子性(Atomicity):数据库的逻辑工作单位。(2)一致性(Consistency):使数据库从一个一致性状态变到另一个一致性状悉。(3)隔离性(Isolation):不能被其他事务干扰。(4)持续性(永久性)(Durability):一旦提交,改变就是永久性的。事务通常以BEGINTRANSACTION(事务开始)语句开始,以COMMIT或ROLLBACK语句结束。COMMIT称为“事务提交语句”,表示事务执行成功地结束。ROLLBACK称为“事务回退语句”,表示事务执行不成功地结束。从终端用户来看,事务是一个原子,是不可分割的操作序列。事务中包括的所有操作要么都做,要么都不做(就效果而言)。事务不应该丢失或被分割完成。在多用户共享系统中,许多事务可能同时对同一数据进行操作,称为“并发操作”,此时数据库管理系统的并发控制子系统负责协调并发事务的执行,保证数据库的完整性不受破坏,同时避免用户得到不正确的数据。

  • 第14题:

    事务管理的特性叙述不正确的是

    A.事务管理特性包括:(1)原子性、(2)一致性(Consistency)(3)隔离性(Isolation)、(4)持续性(永久性)(Durability)
    B.原子性(Atomicity)是指数据库的逻辑工作单位。
    C.隔离性(Isolation)是指可以被其他事务干扰。
    D.持续性(永久性)(Durability)是指一旦提交,改变就是永久性的

    答案:C
    解析:

  • 第15题:

    事务的ACID性质中,关于原子性(atomicity)的描述正确的是_( )_。

    A.指数据库的内容不出现矛盾的状态
    B.若事务正常结束,即使发生故障,更新结果也不会从数据库中消失
    C.事务中的所有操作要么都执行,要么都不执行
    D.若多个事务同时进行,与顺序实现的处理结果是一致的

    答案:C
    解析:

  • 第16题:

    A transaction is an action,or a series of actions,carried out by a single user or(请作答此空),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.

    A.application developer
    B.all users
    C.application program
    D.DBMS

    答案:C
    解析:

  • 第17题:

    事务的性质:()(Atomicity)、()(Consistency)、()(Isolation)、()(Durability)。


    正确答案:原子性;一致性;隔离性;持久性

  • 第18题:

    事务的ACID性质中,关于原子性(Atomicity)的描述正确的是()。

    • A、指数据库的内容不出现矛盾的状态
    • B、若事务正常结束,即使发生故障,更新结果也不会从数据库中消失
    • C、事务中的所有操作要么都执行,要么都不执行
    • D、若多个事务同时进行,与顺序实现的处理结果是一致的

    正确答案:C

  • 第19题:

    在SQL SERVER中可以使用SET TRANSACTION ISOLATION语句设置事务的隔离级别,SQL SERVER的默认隔离级别是()。


    正确答案:READ COMMITED

  • 第20题:

    CNA正确的工作流程是()

    • A、create a planned area→adjust→change data→update→consistency check
    • B、adjust→create a planned area→change data→consistency check→update
    • C、consistency check→adjust→create a planned area→change data→update

    正确答案:B

  • 第21题:

    事务的特性有()。

    • A、原子性(Atomicity)
    • B、一致性(Consistency)
    • C、隔离性(1solation)
    • D、可生存性(Survivability)
    • E、持续性(Durability)

    正确答案:A,B,C,E

  • 第22题:

    多选题
    事务的特性有()
    A

    原子性(Atomicity)

    B

    一致性(ConsistemL)

    C

    隔离性(Isolation)

    D

    可生存性(Survivability)

    E

    持续性(Durability)


    正确答案: C,E
    解析: 暂无解析

  • 第23题:

    填空题
    事务的性质:()(Atomicity)、()(Consistency)、()(Isolation)、()(Durability)。

    正确答案: 原子性,一致性,隔离性,持久性
    解析: 暂无解析

  • 第24题:

    多选题
    事务的特性有()。
    A

    原子性(Atomicity)

    B

    一致性(Consistency)

    C

    隔离性(1solation)

    D

    可生存性(Survivability)

    E

    持续性(Durability)


    正确答案: C,A
    解析: 暂无解析