Abstract:
Distributed Database has been used as the
most essential technology for business organizations
in recent years. The data allocation is a critical issue
in distributed database design. Allocation of data
among different sites across the network effects on
the performance of the distributed database system.
The static allocation supports only limited response
to the change in workload. This paper proposes a
hybrid strategy for non-replicated dynamic fragments
allocation in distributed database system. The
proposed hybrid algorithm is modified by using
selective concepts of Threshold Time Volume and
Distance Constraints algorithm and Region based
Fragment Allocation algorithm. This algorithm
modifies Threshold Time Volume and Distance
Constraints algorithm by considering a concept of
region instead of distance factors. It reallocates
fragment with respect to the average maximum data
volume of that region access to fragment instead of
considering the high frequency of individual site. It
will reduce the migration of the fragment over
different sites and also improve the overall
performance of the system.
