Introduction to database system Chapter 1 short answer questions - how was the final exam?

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1. Trial data 、 database 、 Database system 、 The concept of database management system

data ： The symbolic record that describes things is called data . The types of data are words 、 graphics 、 image 、 voice 、 Text, etc . Data and its semantics are inseparable .

database ： Database is stored in computer for a long time 、 organized 、 Sharable data set . The databases in the database are organized according to a certain data model 、 Description and storage , With less redundancy 、 High data independence and scalability , And can be shared by users .

Database system （DBS）： It refers to the system composition after introducing database into computer system . A database system consists of a database 、 Database management system （ And its development tools ）、 Application system 、 Database administrators constitute .

Database management system （DBMS）： It is a layer of data management software between the user and the operating system .

2. What are the benefits of using a database system ？

Greatly improve the efficiency of application development , Convenient for users , Reduce the maintenance burden of database system managers .

3. Try to describe the difference and relationship between file system and database system

difference ：
The file system is oriented to an application , Sharing check 、 It's redundant 、 Poor independence 、 There is a structure in the record 、 There is no structure as a whole , The application controls itself .
The database system faces the real world , High sharing , Little redundancy 、 It has a high degree of physical independence and a certain degree of logical independence , Overall structure , Describe... With a data model , Data security is provided by the database management system 、 integrity 、 Concurrency control and recovery capability .
contact ：
Are software that manages data in computer systems .

4. Give an example of a file system rather than a database system , Then give an application example suitable for database system

• Examples of applications that apply to file systems rather than database systems
  Data backup , For temporary data storage during the use of software or application programs, it is generally appropriate to use files .
  The early function is relatively simple 、 Relatively fixed application systems are also suitable for file systems .
• Examples of applications that apply to database systems rather than file systems
  at present , Almost all information systems of enterprises or departments are based on database system , All use databases . Such as the management information system of a factory （ It will include many subsystems , Such as inventory management system 、 Material procurement system 、 Job scheduling system 、 Equipment management system 、 Personnel management system, etc ）

5. Try to describe the characteristics of database system

1. Data structure
2. High data sharing 、 Low redundancy 、 Easy to expand
3. High data independence
4. Data from DBMS Unified management and control

6. What are the main functions of database management system ？

1. Database definition function
2. Data access function
3. Database operation management
4. Establishment and maintenance of database

7. Try to explain the function of conceptual model

The conceptual model is actually an intermediate level from the real world to its world . Conceptual models are used to model the information world , It's the first level of abstraction from the real world to the information world , It is a favorable tool for database designers to design databases , It is also a language for communication between database designers and users .