A distributed database is a logical database whose physical databases are geographically distributed across a network of computers in multiple database management systems, which constitute a distributed database management system

In a distributed database management system, a user on each computer accessing a database does not feel that the data he is using is not physically stored on their own computers, but by the distributed database system by the network from other machines to transfer over

Therefore, for each user to see is a unified conceptual model

The main features of distributed database systems are: (1) a high degree of reliability, when one of the machines in the system fails, will not lead to the destruction of the entire system

When the fault is removed, the distributed database system can be restored during the failure of the database to modify

(2) dispersed workload, so that a large number of processing evenly shared

(3) easy to realize the expansion of the system

Distributed database system is a product of the combination of computer communications and database technology, is very representative of the direction of development of database technology

Distributed database system is a combination of computer communications and database technology, is very representative of the direction of development of database technology One of the