What is the role of database in computer applications

The role of the database in computer applications is: 1. To achieve data sharing; 2. To reduce data redundancy; 3. Data independence; 4. To achieve centralized control of data; 5. Data consistency and Maintainability to ensure data security and reliability; 6. Fault recovery.

The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.

A database is a warehouse that stores data. It has a large storage space and can store millions, tens of millions, or hundreds of millions of pieces of data. However, the database does not store data arbitrarily, there are certain rules, otherwise the query efficiency will be very low. Today's world is an Internet world full of data, filled with a lot of data. That is, this Internet world is the data world. There are many sources of data, such as travel records, consumption records, web pages browsed, messages sent, etc. In addition to text type data, images, music, and sounds are all data.

A database is a computer software system that stores and manages data according to a data structure. The concept of database actually includes two meanings:

(1) Database is an entity, which is a "warehouse" that can reasonably store data. Users store transaction data to be managed in this "warehouse". "Data" " and "library" are combined into a database.

(2) Database is a new method and technology for data management. It can organize data more appropriately, maintain data more conveniently, control data more closely and utilize data more effectively.

The role of the database:

1. Realize data sharing

Data sharing includes all users who can access the data in the database at the same time, including users The database can be used in various ways through interfaces and provides for data sharing.

2. Reduce data redundancy

Compared with the file system, because the database realizes data sharing, it avoids users from creating application files individually. It reduces a large amount of duplicate data, reduces data redundancy, and maintains data consistency.

3. Data independence

The independence of data includes logical independence (the logical structure of the database and the application program in the database are independent of each other) and physical independence (changes in the physical structure of the data are not Affects the logical structure of the data). (Recommended tutorial: mysql video tutorial)

4. Centralized control of data

In the file management method, the data is in a scattered state, different users or the same Users have no relationship between their files in different processes. The database can be used to centrally control and manage data, and the data model can be used to represent the organization of various data and the connections between data.

5. Data consistency and maintainability to ensure the security and reliability of data

Mainly include: security control, integrity control, concurrency control, so that in the same time period It allows multiple access to data and prevents abnormal interactions between users.

6. Fault recovery

The database management system provides a set of methods to detect and repair faults in time, thereby preventing data from being damaged. The database system can recover as quickly as possible from failures that occur when the database system is running, which may be physical or logical errors. For example, data errors caused by misoperation of the system, etc.

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