Implementing the Update Propagation Strategies on Replicated Database

Abstract

A distributed database is a database with its data elements stored at several sites of a computer network. Certain data items may be redundantly stored at more than one site for reliability reasons. A replicated database is a distributed database in which multiple copies of the same data items are stored at different sites. Distributed applications frequently use replication as a means to achieve higher level of performance, reliability and availability. Replication is a technique for automatically maintaining the availability of data despite server failures. If data are replicated at two or more failure-independent servers then client software may be able to access data at alternative servers. The basic problem with data replication is update propagation. In this paper, we propose a system that handles replica updates in a distributed database system called Lazy and Eager. This system will be implemented by using C#.NET and Access database.