The design of a distributed database system is a complex task. Therefore, a careful assessment of the strategies and objectives is required. Some of the strategies and objectives that are common to the most DBS design are as follows:
Data fragmentation, which are applied to relational database system to partition the relations among network sites.
Data allocation, in which each fragment is stored at the site with optimal distribution.
Data replication, which increases the availability and improves the performance of the system.
Location transparency, which enables a user to access data without knowing, or being concerned with, the site at which the data resides. The location of the data is hidden ...