The difference between a relational database system and a file database system where are the relational database systems generally applicable?

The difference between a relational database system file system is:

First, the overall data of a relational database is structured and described by a relational data model, which is fundamentally different from the file system. (data models include: Data structures, operations, and integrity constraints)

Secondly, the relational database system has high sharing, the redundancy is low can face the whole system, and the file system has the limitation of application scope, it is not easy to expand.

Thirdly, the relational database system adopts the two-level mapping mechanism to ensure the high independence of data, so that the program writing and data are highly independent. This is a file system that cannot be achieved, it can only be targeted to a specific application. (Level Two mapping: External mode / pattern mapping to ensure logical independence and internal mode/pattern mapping to ensure physical independence .) External mode: User mode, is a description of the logical structure characteristics of the local data of the database user. Schema: A description of the logical structure characteristics of the database's entire data. Internal mode: The description of the final physical storage structure of the data. )

The other is that the relational database system is managed by a unified DBMS to provide data such as security protection, concurrency control, integrity checking, and database recovery services.

The difference between a relational database system and a file database system where are the relational database systems generally applicable?