What are the main tasks of database logic design?

The main task of database logical design is: creating the database schema. The main task of database logical design is to design the conceptual data model of the real world into a logical model of the database, that is, adapted to the logical data model supported by a specific database management system.

Database Design refers to constructing the optimal database model for a given application environment, establishing the database and its application system, and making it Able to effectively store data to meet the application needs of various users (information requirements and processing requirements). In the field of databases, various systems that use databases are often collectively referred to as database application systems.

The design content of database design includes: requirements analysis, conceptual structure design, logical structure design, physical structure design, database implementation and database operation and maintenance.

Among them, the logical structure design of the database

is to convert the basic entity-relationship diagram designed in the conceptual structure design stage into one supported by the selected database management system product. The data model conforms to the logical structure.

The main job is to design the conceptual data model of the real world into a logical model of the database, that is, adapted to the logical data model supported by a specific database management system. At the same time, corresponding logical sub-patterns may need to be generated for various data processing application areas. The result of this step of design is the so-called "logical database".

Design steps

(1) Convert the conceptual structure into a general relationship, network, and hierarchical model;

(2) Convert it to Convert the relationship, network, and hierarchical models to the data model supported by the specified database management system;

(3) Optimize the data model.

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