What are the main functions of a database management system?

The main functions of the database management system are: 1. Data definition; 2. Data operation; 3. Database operation and management; 4. Data organization, storage and management; 5. Database protection; 6. Database maintain.

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

The main functions of the database management system are as follows:

1. Data definition. DBMS provides data definition language DDL for users to define the three-level schema structure, two-level image, integrity constraints, confidentiality restrictions and other constraints of the database.

2. Data operation. DBMS provides data operation language DML for users to perform operations such as appending, deleting, updating, and querying data.

#3. Database operation management. The operation management function of the database is the operation control and management function of the DBMS, including concurrency control in a multi-user environment, security check and access restriction control, integrity check and execution, organization and management of operation logs, transaction management and automatic recovery .

4. Data organization, storage and management. DBMS needs to classify, store and manage various data, including data dictionary, user data, access paths, etc. It needs to determine what file structure and access method to organize these data at the storage level.

5. Database protection. The data in the database is a strategic resource in the information society, so data protection is crucial.

6. Database maintenance. This part includes functions such as database data loading, conversion, dumping, database reorganization and reconstruction, and performance monitoring.

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