Major objective of this lecture is to presentation on Distributed Databases, here focus which benefits and issues to be considered. Distributed Databases is a database in which usually storage devices usually are not all attached to some common processing unit including the CPU, controlled by way of a distributed database supervision system. The Distributed Databases are saved on several computer systems, interconnected through community. Each site could process local purchases involving data only on that web page. Some sites may become involved in global transactions, which usually access data through several sites.