Rajat sharan
errajatsharan@gmail.com
Abstract: The dream of computing power as readily available as the electricity in a wall socket is coming closer to reality with the arrival of grid and cloud computing. At the same time, databases grow to sizes beyond what can be efficiently managed by single server systems. There is a need for efficient distributed database management systems (DBMSs). Current distributed DBMSs are not built to scale to more than tens or hundreds of sites (i.e., nodes or computers). Users of grid and cloud computing expect not only almost infinite scalability, i.e., at least to thousands of sites, but also that the scale is adapted automatically to meet the demand, whether it increases or decreases. This is a challenge to current distributed DBMSs. The purpose of this paper is to present an introduction to Distributed Databases which are becoming very popular now a days. Today’s business environment has an increasing need for distributed database and Client/server applications as the desire for reliable, scalable and accessible information is Steadily rising. Distributed database systems provide an improvement on communication and data processing due to its data distribution throughout different network sites.
Keywords: Distributed databases fundamentals, current research: query optimization, distribution optimization, fragmentation optimization.
I . Introduction
In today’s world of universal dependence on information systems, all sorts of people need access to companies’ databases. In addition to a company’s own employees, these include the company’s customers, potential customers, suppliers, and vendors of all types. It is possible for a company to have all of its databases concentrated at one mainframe computer site with worldwide access to this site provided by telecommunications networks, including the Internet. Although the management of such a