Basic Concepts of Database Systems

data, database, database management system, database system

1. Data is the basic object stored in the database

Definition of data

    An identifiable symbol recorded by people to reflect the objective world

Kind of data

•      Numerical data: 0-9

•     Non-numeric data: characters, text, sounds, graphics, images, etc.

2. Definition of database

    Database (DB, referred to as DB) is a collection of large amounts of data that is organized and shared in a long-term storage in a computer. The basic characteristics of a
database
    

•     Data is organized, described and stored according to a certain data model

•     Can be shared with various users

•     The data are closely related, with minimal redundancy and high independence

•     serve a specific application

A database management system

is a collection of computer programs used to create and maintain databases

• between the operating system and user applications         
  
•    always based on some kind of data model
• The product of the database vendor usually refers to the DBMS