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This article is about what needs to be modified to ensure the data independence of the database. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

What needs to be modified to ensure the data independence of the database?

In order to ensure the data independence of the database, it is necessary to modify the mapping between the schema and the internal schema.

DBMS provides two layers of images: the external mode / mode image and the pattern / inner mode image. The image from the outer schema to the schema ensures the logical independence of the data, and from the schema to the inner schema ensures the physical independence of the data.

Knowledge expansion:

The independence of data is one of the most basic features of database system.

Data independence means that applications and data structures are independent of each other and do not affect each other.

In the three-tier schema architecture, data independence refers to the ability of the database system to change the schema at a certain level without changing the schema at the upper level.

It is the two-layer image between the three-level modes that ensures the high data independence of the data in the database system.

Data independence includes data logical independence and data physical independence.

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