Detail: After class exercise answer: Chapter 1 Introduction 1. Explain the concepts of data, databases, database systems, and database management systems\ Answer:\ N (l) Data: The symbolic records that describe things are called data. The types of data include numbers, text, graphics, images, sound, text, etc. Data and its semantics are inseparable. The concept of data analysis in modern computer systems is broad. Early computer systems were mainly used for scientific computing, processing data such as integers, real numbers, floating-point numbers, and other traditional mathematical data. Modern computers can store and process a wide range of objects, and the data representing these objects is becoming increasingly complex. Data and its semantics are inseparable. The number 500 can indicate that the price of an item is 500 yuan, or that there are 500 attendees at an academic conference, or that a bag of milk powder weighs 500 grams\ N (2) Database (DB): A database is an organized and shareable collection of data that is stored in a computer for a long time. The data in the database is organized, described, and stored according to a certain data model, with low redundancy, high data independence, and easy scalability, and can be shared by various users\ N (3) Database System (DataBas. Sytem, abbreviated as DBS): A database system refers to a system composed of a database introduced into a computer system, generally consisting of a database, a database management system (and its development tools), an application system, and a database administrator. Analyzing database systems and databases are two different concepts. A database system is a one person one machine system, and the database is a component of the database system. But in daily work, people often refer to database systems as databases. I hope readers can distinguish between "database systems" and "databases" from the context of people's speech or articles, without causing confusion\ N (4) Database Management Systems (DBMs): DBMs are a layer of data management software located between users and operating systems, used to scientifically organize and store data, efficiently retrieve and maintain data. The main functions of DBMS include data definition, data manipulation, database operation management, and database establishment and maintenance. Analyzing DBMS is a large and complex software system, which is the fundamental software in computers. At present, there are many manufacturers specializing in the development of DBMS and their DBMS products. Famous ones include IBM's DBZ relational database management system and IMS hierarchical database management system, Oracle's orade relational database management system S Oil ase's S Oil ase relational database management system, Microsoft's SQL Serve, relational database management system, etc\ n What are the benefits of using a database system\ Answer:

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