当前位置:网站首页>Tutorial on the principle and application of database system (008) -- exercises on database related concepts
Tutorial on the principle and application of database system (008) -- exercises on database related concepts
2022-07-07 12:15:00 【Rsda DBA_ WGX】
Database system principle and Application Tutorial (008)—— Database related concept exercises
One 、 Short answer
1、 What is data ? What are the characteristics of the data ?
answer :
(1) Data is a symbolic record used to describe things .
(2) Data has the following characteristics :
A) Data is the reflection of the attributes of things .
B) Data is constrained by data type and value range .
C) Data has carrier and manifestation .
2、 What are the main tasks of data management ?
answer : Data management mainly includes the following aspects :
(1) Organize and save data ;
(2) Manage and maintain data ;
(3) Data query and statistics .
3、 What is a database ? What are the characteristics of the data in the database ?
answer :
(1) The database is stored in the computer for a long time , Organized 、 Sharable data set . Database is a new method and technology of data management , He can organize data more reasonably 、 More convenient maintenance data 、 Tighter control of data and more efficient use of data .
(2) The data in the database has the following characteristics :
A) The data in the database has a certain organizational structure , Can be Shared .
B) The data in the database has integrity , It is a reflection of the attributes of things managed .
4、 What is database management system ? What are its main functions ?
answer :
(1) Database management system is a layer of data management software between user application and operating system , Is the core component of the database system , Manage and maintain the database .
(2)DBMS The functions are as follows :
A) Define database ;
B) Manipulating databases ;
C) Control database ;
D) Fault recovery ;
E) The data transfer .
Defining and manipulating databases is DBMS Basic functions of .
5、 The database system consists of those parts ?
answer :DBS By database 、 Database management system 、 Application system 、 Users of the database system 、 Database administrators consist of .
6、 Detail the three-level schema structure of the database system .
answer : The three-level schema of database includes logical schema 、 External mode 、 Internal mode .
(1) A logical schema is a description of the overall logical structure and characteristics of data in a database . Logical mode is to reduce data redundancy 、 Implement data sharing , A unified global data view obtained by integrating the data of all users .
(2) External mode is a description of the logical structure and characteristics of the data involved in each user or program . External mode can facilitate users to use data , Improve data security .
(3) Internal schema is the internal representation and underlying description of data . Internal mode can organize the global logical mode into the optimal structure and save it in the computer , To improve the efficiency of data access , Improve the performance index of the system .
7、 What is data independence ? How does the database system ensure the independence of data ?
answer : Data independence refers to the degree of dependency between applications and data . Data independence is divided into logical independence and physical independence .
A) The logical independence of data refers to the dependence of applications on the global logical structure of data . When the global logical structure of the database system changes , If the corresponding application does not need to make any changes , It shows that the logical independence of data is very high .
B) The physical independence of data refers to the dependence of applications on the data storage structure . When the physical structure of the data changes , If the corresponding application does not need to be modified , It indicates that the physical independence of the data is very high .
8、 Describe the secondary image technology of database and its function .
answer :
(1) In order to achieve transparency between users and data , The database management system provides a secondary image : External mode / Pattern image ; Pattern / Internal mode image .
(2) The secondary image ensures that the data in the database system can have high logical independence and physical independence .
A) External mode / Pattern image : External mode / Pattern mapping defines the correspondence between external patterns and patterns , External mode / Schema images are generally described in external schemas . When the mode changes ,DBA You can change the external mode by modifying the image . Because the application is designed according to the external pattern , As long as the external mode does not change , The application does not need to be modified . External mode / Schema mapping technology not only establishes the corresponding relationship between user database and logical database , At the same time, it also ensures the logical independence of data .
B) Pattern / Internal mode image : Pattern / The inner schema image defines the corresponding relationship between logical schema and inner schema . When the storage structure of the database changes ,DBA You can modify the mode / The mapping between internal schemas keeps the data schema unchanged . Because users or programs use data according to the logical mode of data , So as long as the data pattern remains the same , Users can still use the data the same way , The program does not need to be modified , Ensure the physical independence of data .
Two 、 choice question
1、 Which of the following options is not a basic function of a database management system ?( D )
(A) Database definition (B) The establishment and maintenance of database (C) Database access
(D) Communication between database and other software systems in the network
2、 In the three-level schema structure of the database , The internal mode has ( A ) individual , The logical modes are (A) individual , External mode has (D) individual ?
(A)1 individual (B)2 individual (C)3 individual (D) Any number of
3、 In database management system , Which module is not a database access function module ?(A)
(A) Transaction manager module (B) Data updater module (C) Interactive query module (D) Query handler module
4、 In the following description , Those are not the main features of database technology ?(D)
(A) The structure of data (B) Data redundancy is small (C) High data independence (D) Standardization of procedures
5、(B) It is organized according to a certain data model 、 Long term storage in the computer 、 Sharable data set .
(A) Database system (B) database (C) relational database (D) Database management system
6、 Which of the following is not the control function of the database management system ?(B)
(A) Security (B) Portability (C) integrity (D) concurrency control
7、 Database (B) It refers to the correctness and compatibility of data .
(A) Security (B) integrity (C) concurrency control (D) Data recovery
8、 Database (B) It is to ensure that the modification of the database by authorized users will not affect the consistency of data .
(A) Security (B) integrity (C) concurrency control (D) Data recovery
9、 Database system , Physical independence refers to ()
(A) The independence of database and database management system
(B) Application and DBMS Are independent of each other
(C) The physical mode of the application and the database stored on disk are independent
(D) The logical structure of the data in the application and database are independent of each other
10、 The characteristics of database system are (A)、 Data independence 、 Low data redundancy 、 Avoid data inconsistency 、 Provide data protection function .
(A) Data sharing (B) data storage (C) Data applications (D) Data protection
11、 The database management system realizes data query 、 Insert 、 Delete 、 The database language of the update operation is (C).
(A) Data definition language (B) Data management language (C) Data manipulation language (D) Data control language
12、 In the three-level schema structure of the database , What describes the global logical structure and characteristics of a database is (D).
(A) External mode (B) Internal mode (C) Storage mode (D) Pattern
13、 Division of database three-level schema structure , It is conducive to ensuring the (A).
(A) Data independence (B) Data security (C) Structural standardization (D) Operational feasibility
14、 Data sharing is the main feature of database , Data sharing here refers to (C).
(A) Multiple programs in the same application share a data set
(B) Multiple users 、 Share data in the same language
(C) Multiple users share a data file
(D) Multiple applications 、 A variety of languages 、 Multiple users use data sets that cover each other
15、 database (DB)、 Database system (DBS) And database management system (DBMS) The relationship between (A).
(A)DBS contain DB and DBMS (B)DBMS contain DB and DBS (C)DB contain DBS and DBMS
(D)DBS Namely DB, That is to say DBMS
16、 The symbolic record describing things is called (B).
(A) Information (B) data (C) Record (D) Record set
17、(A) It is a layer of data management software between the user and the operating system .
(A) Database management system (B) Database system (C) database (D) Database application system
18、 To ensure the data independence of the database , Need modification (A).
(A) Two mappings between three-level patterns (B) Patterns and inner patterns (C) Pattern and outer pattern (D) Three level mode
19、 Which of the following statements is not true ?(C)
(A) Database reduces data redundancy (B) The data in the database can be shared
(C) The database avoids the duplication of all data (D) The database has high data independence
20、 Ensure the physical independence of data , Need modification (B).
(A) Pattern (B) Mapping between patterns and inner patterns (C) Mapping between schema and external schema (D) Internal mode
21、 Which of the following does not describe the characteristics of the database ?(C)
(A) Data is shared (B) Data integrity (C) High data redundancy (D) High data independence
22、 The description of the data view used by a single user is called (A).
(A) External mode (B) Conceptual model (C) Internal mode (D) Storage mode
23、 Subscheme DDL Used to describe the ().
(A) The overall logical structure of the database (B) Local logical structure of data
(C) The physical storage structure of the database (D) Conceptual structure of database
边栏推荐
- 小红书微服务框架及治理等云原生业务架构演进案例
- Superscalar processor design yaoyongbin Chapter 8 instruction emission excerpt
- 111. Network security penetration test - [privilege escalation 9] - [windows 2008 R2 kernel overflow privilege escalation]
- 112.网络安全渗透测试—[权限提升篇10]—[Windows 2003 LPK.DDL劫持提权&msf本地提权]
- Problem: the string and characters are typed successively, and the results conflict
- NGUI-UILabel
- Ask about the version of flinkcdc2.2.0, which supports concurrency. Does this concurrency mean Multiple Parallelism? Now I find that mysqlcdc is full
- Flet教程之 18 Divider 分隔符组件 基础入门(教程含源码)
- Sonar:Cognitive Complexity认知复杂度
- 什么是局域网域名?如何解析?
猜你喜欢
Improve application security through nonce field of play integrity API
Stm32f1 and stm32subeide programming example -max7219 drives 8-bit 7-segment nixie tube (based on SPI)
30. Few-shot Named Entity Recognition with Self-describing Networks 阅读笔记
The road to success in R & D efficiency of 1000 person Internet companies
ES底层原理之倒排索引
【纹理特征提取】基于matlab局部二值模式LBP图像纹理特征提取【含Matlab源码 1931期】
zero-shot, one-shot和few-shot
Hi3516全系统类型烧录教程
Review and arrangement of HCIA
Mastering the new functions of swiftui 4 weatherkit and swift charts
随机推荐
数据库系统原理与应用教程(011)—— 关系数据库
110. Network security penetration test - [privilege promotion 8] - [windows sqlserver xp_cmdshell stored procedure authorization]
Flet tutorial 17 basic introduction to card components (tutorial includes source code)
EPP+DIS学习之路(2)——Blink!闪烁!
5V串口接3.3V单片机串口怎么搞?
SwiftUI 4 新功能之掌握 WeatherKit 和 Swift Charts
Camera calibration (2): summary of monocular camera calibration
数据库系统原理与应用教程(007)—— 数据库相关概念
Flet教程之 18 Divider 分隔符组件 基础入门(教程含源码)
Detailed explanation of debezium architecture of debezium synchronization
顶级域名有哪些?是如何分类的?
Camera calibration (1): basic principles of monocular camera calibration and Zhang Zhengyou calibration
从工具升级为解决方案,有赞的新站位指向新价值
NPC Jincang was invited to participate in the "aerospace 706" I have an appointment with aerospace computer "national Partner Conference
MATLAB实现Huffman编码译码含GUI界面
Rationaldmis2022 advanced programming macro program
Fleet tutorial 15 introduction to GridView Basics (tutorial includes source code)
Introduction to three methods of anti red domain name generation
111. Network security penetration test - [privilege escalation 9] - [windows 2008 R2 kernel overflow privilege escalation]
Flet教程之 19 VerticalDivider 分隔符组件 基础入门(教程含源码)