中国石油大学数据库原理及应用-第三次在线作业

中国石油大学数据库原理及应用-第三次在线作业
中国石油大学数据库原理及应用-第三次在线作业

第三次在线作业

单选题 (共40道题)

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1.(

2.5分)关系代数的基本操作组成关系代数的完备操作集,其他操作均可以由基本操作来表达。具体而言,关系代数的基本操作有()。

? A、差、笛卡尔积、连接和选择

? B、差、交、连接和选择

? C、差、笛卡尔积、投影和选择

? D、差、交、除和笛卡尔积

我的答案:C 此题得分:2.5分

2.(2.5分)在具有非过程性查询语言的数据库系统中,()是查询处理的核心。

? A、扫描与语法检查

? B、查询优化

? C、查询代码生成

? D、查询执行

我的答案:B 此题得分:2.5分

3.(2.5分)关系数据库系统的查询处理包括两个方面的内容:查询优化和()。

? A、实现各种关系代数操作的算法

? B、实现查询的语句

? C、保证安全性

? D、保证一致性

4.(2.5分)()是选择操作中的线性搜索算法。

? A、选择条件是在某个属性上的相等比较,并且操作关系已经按该属性进行排序

? B、选择条件是定义在主索引属性或HASH属性上的相等比较

? C、选择条件是定义在主索引属性上的非相等比较

? D、顺序地读取被操作关系的每个元组,测试该元组是否满足选择条件,如果满足,则作为一个结果元组输出

我的答案:D 此题得分:2.5分

5.(2.5分)()是选择操作中的主索引搜索算法。

? A、选择条件是在某个属性上的相等比较,并且操作关系已经按该属性进行排序

? B、选择条件是定义在主索引属性或HASH属性上的相等比较

? C、选择条件是定义在主索引属性上的非相等比较

? D、顺序地读取被操作关系的每个元组,测试该元组是否满足选择条件,如果满足,则作为一个结果元组输出

我的答案:B 此题得分:2.5分

6.(2.5分)设关系R和S的属性个数分别为r和s,则(R×S)操作结果的属性个数为()。

? A、r+s

? B、r-s

? C、r

? D、max(r,s)

我的答案:A 此题得分:2.5分

7.(2.5分)查询处理最终可转化成基本的()代数操作。

? A、关系

? B、算法

? C、空值

? D、集合

8.(2.5分)计算笛卡尔乘积的最简单算法称为()。

? A、大关系算法

? B、主存算法

? C、嵌套循环算法

? D、半主存算法

我的答案:C 此题得分:2.5分

9.(2.5分)在SQL中,表示选择操作的语句为()。

? A、SELECT * FROM R WHERE C1 AND C2 OR C3

? B、SELECT R.*,S.* FROM R,S WHERER.A S.B

? C、INSERT INTO R VALUE(a,b,c,d)

? D、UPDATE R SET A=a WHEREC1 AND C2 OR C3

我的答案:A 此题得分:2.5分

10.(2.5分)在SQL中,表示连接操作的语句为()。

? A、SELECT * FROM R WHEREC1 AND C2 OR C3

? B、SELECT R.*,S.* FROM R,S WHERER.A S.B

? C、INSERT INTO R VALUE(a,b,c,d)

? D、UPDATE R SET A=a WHEREC1 AND C2 OR C3

我的答案:B 此题得分:2.5分

11.(2.5分)投影操作中不包含主键,需要去除重复()。

? A、关系

? B、列

? C、属性

? D、元组

我的答案:D 此题得分:2.5分

12.(2.5分)关系代数的四个组合操作是:交、自然连接、连接和()。

? A、笛卡尔积

? B、差

? C、商

? D、并

我的答案:C 此题得分:2.5分

13.(2.5分)下列运算中()不是关系代数的基本操作。

? A、笛卡尔积

? B、自然连接

? C、投影

? D、并

我的答案:B 此题得分:2.5分

14.(2.5分)关系运算中花费时间可能最长的运算是()。

? A、笛卡尔积

? B、选择

? C、投影

? D、商

我的答案:A 此题得分:2.5分

15.(2.5分)对于同一个查询,使用不同的查询策略会得到()。

? A、不同的查询结果

? B、相同的时间开销

? C、不同的时间开销

? D、近似的查询结果

我的答案:C 此题得分:2.5分

16.(2.5分)当一个查询中具有选择和连接时,查询优化的方法是()。

? A、先执行连接后执行选择

? B、先执行选择后执行连接

? C、先执行哪个都可以

? D、上述都不对

我的答案:B 此题得分:2.5分

17.(2.5分)查询树是一种表示关系代数表达式的()结构。

? A、树形

? B、层次

? C、星形

? D、上述都不对

我的答案:A此题得分:2.5分

18.(2.5分)查询树以()方式执行。

? A、自顶向下

? B、自底向上

? C、两端向中间

? D、中间向两端

我的答案:B 此题得分:2.5分

19.(2.5分)给定一个用高级语言定义的查询,需要下面两步()来

构造该查询的内部表示。

? A、第一步把用高级语言定义的查询树转换为关系代数表达式;

第二步把关系代数表达式转换为查询。

? B、第一步把用高级语言定义的查询转换为关系代数表达式;

第二步把关系代数表达式转换为查询树。

? C、第一步把用高级语言定义的关系代数表达式转换为查询树;

第二步把查询树转换为查询。

? D、第一步把用高级语言定义的关系代数表达式转换为查询;

第二步把查询转换为查询树。

我的答案:B 此题得分:2.5分

20.(2.5分)在关系代数表达式优化策略中,应尽可能早执行()操作。

? A、投影

? B、连接

? C、选择

? D、笛卡尔积

我的答案:C 此题得分:2.5分

21.(2.5分)关系数据库的查询语言是一种()语言。

? A、过程性

? B、非过程性

? C、第三代

? D、高级程序设计

我的答案:B 此题得分:2.5分

22.(2.5分)下面()不是一种关系数据库语言。

? A、关系操作

? B、关系代数

? C、元组关系演算

? D、域关系演算

我的答案:A 此题得分:2.5分

23.(2.5分)关系代数、元组关系演算和域关系演算这三种数据库语言之间的关系是()。

? A、相互依赖

? B、相互独立

? C、相互等价

? D、相互转化

我的答案:C 此题得分:2.5分

24.(2.5分)一般情况下,当对关系R和S使用自然联接时,要求R 和S至少含有一个共同的()。

? A、记录

? B、行

? C、数据字典

? D、属性

25.(2.5分)在对关系数据库的基本操作中,()是从表中取出满足某种条件的属性成分操作,即从列的方向进行选择所需的值。

? A、选择

? B、扫描

? C、检索

? D、投影

我的答案:D 此题得分:2.5分

26.(2.5分)在对关系数据库的基本操作中,()是表中选取满足某种条件的元组的操作,相当于在横向进行选择。

? A、选择

? B、扫描

? C、检索

? D、投影

我的答案:A 此题得分:2.5分

27.(2.5分)在SQL的SELECT语句中,与选择运算对应的命令动词是()。

? A、SELECT

? B、FROM

? C、WHERE

? D、GROUP BY

我的答案:C 此题得分:2.5分

28.(2.5分)在SQL的SELECT语句中,对应关系代数中" 投影" 运算的语句是()。

? A、SELECT

? B、FROM

? C、WHERE

? D、SET

29.(2.5分)数据库管理系统允许用户把一个或多个数据库操作组成(),它是一组按顺序执行的操作单位。

? A、命令

? B、事务

? C、文件

? D、程序

我的答案:B 此题得分:2.5分

30.(2.5分)如果事务T对数据D已加X锁,则其他事务对数据D ()。

? A、可以加S锁,不能加X锁

? B、可以加S锁,也可以加X锁

? C、不能加S锁,可以加X锁

? D、不能加任何锁

我的答案:D 此题得分:2.5分

31.(2.5分)数据库中的封锁机制是()的主要方法。

? A、完整性

? B、安全性

? C、并发控制

? D、恢复

我的答案:C 此题得分:2.5分

32.(2.5分)如果事务T获得了数据项Q上的排它锁,则T对Q()。

? A、只能读不能写

? B、只能写不能读

? C、既可读又可写

? D、不能读不能写

我的答案:C 此题得分:2.5分

33.(2.5分) DBMS中实现事务持久性的子系统是()。

? A、安全性管理子系统

? B、完整性管理子系统

? C、并发控制子系统

? D、恢复管理子系统

我的答案:D 此题得分:2.5分

34.(2.5分)数据库的并发操作可能带来的问题包括()。

? A、丢失更新

? B、数据独立性会提高

? C、非法用户的使用

? D、增加数据冗余度

我的答案:A 此题得分:2.5分

35.(2.5分)下列叙述中,不正确的是()。

? A、事务是不能嵌套的

? B、事务是一个操作序列

? C、一个事务中所有对数据库操作是一个不可分割的操作序列

? D、事务是可以嵌套的

我的答案:A 此题得分:2.5分

36.(2.5分)多个用户同时对同一数据进行操作,描述的是()。

? A、数据库的完整性

? B、数据库的并发控制

? C、数据库的恢复

? D、数据的完整性

我的答案:B 此题得分:2.5分

37.(2.5分)在数据库系统中死锁属于()。

? A、系统故障

? B、程序故障

? C、事务故障

? D、介质故障

我的答案:C 此题得分:2.5分

38.(2.5分)若数据库中只包含成功事务提交的结果,则此数据库就称为处于()状态。

? A、安全

? B、一致

? C、不安全

? D、不一致

我的答案:B 此题得分:2.5分

39.(2.5分)对并发操作若不加以控制,可能会带来()问题。

? A、不安全

? B、死锁

? C、死机

? D、不一致

我的答案:D 此题得分:2.5分

40.(2.5分)事务的原子性是指()。

? A、事务中包括的所有操作要么都做,要么都不做

? B、事务一旦提交,对数据库的改变是永久的

? C、一个事务内部的操作及使用的数据对并发的其他事务是隔离的

? D、事务必须是使数据库从一个一致性状态变到另一个一致性状态

我的答案:A 此题得分:2.5分

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