The conceptual model of a database is independent of "specific machines and DBMS". The conceptual model is used to model the information world. It abstracts the objective objects of the real world into some kind of information structure. This structure does not depend on the specific computer system and is not a data model supported by a certain DBMS. It is actually the real world. to an intermediate level in the machine world.
#The conceptual model of the database is independent of ( ).
A． Specific machine and DBMS
B． Entity relationship diagram
C. Information World
D. Relational model
Answer: A
Analysis: Conceptual model is used to model the information world. It abstracts the objective objects of the real world into certain an information structure. This structure does not depend on the specific computer system and is not a data model supported by a certain DBMS. In fact, it is an intermediate level between the real world and the machine world.
Database conceptual model
Combining object-oriented methods and database technology can make the analysis and design of database systems consistent with people's understanding of the objective world to the greatest extent. consistent.
The database conceptual model is actually an intermediate level from the real world to the machine world. The database conceptual model is used to model the information world. It is the first level of abstraction from the real world to the information world. It is a powerful tool for database designers to carry out database design and is also the language for communication between database designers and users.
Establishing a data conceptual model is a logical model established after analyzing and summarizing the collection, transmission, processing, storage, output, etc. of data in the system from the perspective of data. It is mainly used Used to describe various states of data in the system.
This model does not care about the specific implementation (such as how to store) and details, but mainly cares about the status of data at various processing stages in the system. In fact, the data flow diagram is also a conceptual model of data.
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