What Is a Distributed Database?

Distributed database systems usually use smaller computer systems. Each computer can be placed in a separate place. Each computer may have a full copy of the DBMS, or a partial copy, and have its own local database. Many computers in different locations are connected to each other through the network, and together form a complete, global, logically centralized and physically distributed large database.

Distributed database

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According to the "Distributed Database System Standard" formulated by China, the distributed database system is abstracted into a 4-layer structure model. This structural model has received support and recognition at home and abroad.

The 4-layer model is divided into a global outer layer, a global concept layer, a local concept layer, and a local inner layer, and there are corresponding inter-layer mappings between the layers. This 4-tier model is applicable to homogeneous distributed database systems and also to heterogeneous distributed database systems.