18.2. Distributed Databases
A distributed database system (DDBS) is a database physically stored on several computer systems across several sites connected together via communication network. Each site is typically managed by a DBMS that is capable of running independently of the other sites. In other words, each site is a database system site in its own right and has its own local users, its own local DBMS, and its own local data communications manager. Each site has its own transaction management software, including its own local locking, logging and recovery software. Although geographically dispersed, a distributed database system manages and controls the entire database as a single collection of data. The location of data items and the ...
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