ABSTRACT
Database replication is the copying of part or all of a database to one or more remote sites. The remote site can be in another part of the world, or right next to the primary site. Because of the speed and reliability of the Internet, many people believe that database replication is no longer needed. While it is true that distributed transactions provide access to real-time data almost anywhere in the world, they require that all databases operate all the time. When one database is down for any reason or cannot be contacted, other databases can no longer access its data. Replication solves this problem because each site has a copy of the data.
