OPTIMIZATION OF DISTRIBUTED QUERY USED IN SYNCHRONIZING DATA BETWEEN TABLES WITH DIFFERENT STRUCTURE

Replication can be used to improve local database performance and to improve the availability of applications. An application can access a local database rather than a central database from another site, which minimize network traffic, locking escalation at the central database and achieve maximum performance for current insert, delete or update operations. The application can continue to function if the central database is down, or cannot be contacted due to a communication problem, power or hardware failure. This paper is focused on presenting a synchronization process between a central Microsoft SQL Server database and many remote sites databases. One possible problem in replication can appear when the two databases have different organization of tables and structures.