18.4. Distributed Database System (DDBS) Design

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 ...

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