Similarities and Differences Between Conceptual Data Models and Physical Data Models

Conceptual Data Model (Conceptual Data Model): Conceptual model for short, is a model for the realization of the world for database users, mainly used to describe the conceptual structure of the world, which enables database designers to get rid of computer systems and DBMS in the initial stage of design. Specific technical problems, focusing on analyzing data and the connection between data, etc., have nothing to do with the specific data management system (Database Management System, DBMS for short). The conceptual data model must be replaced by a logical data model before it can be implemented in DBMS.
Physical data Model (Physical Data Model): Physical model for short, is a model for computer physical representation, describing the organization structure of data on storage media, it is not only related to the specific DBMS, but also related to the operating system and hardware. The logical data model has a corresponding physical data model when it is implemented. In order to ensure its independence and portability, most of the implementation of the physical data model is automatically completed by the DBMS, and the designer only designs special structures such as indexing and aggregation. .