Abstract:
The growing number of large knowledge bases
necessitates developing techniques that enable the
sharing and a cooperative scheme for accessing
massively distributed, heterogeneous databases,
created and managed independently by several
research institutions. However, enabling the sharing
of databases without following a predefined common
schema and supporting parallel execution of
distributed queries are remained as major issues and
challenging tasks towards research community. In
this paper, a database integration framework that
supports execution of distributed queries in parallel
has been proposed. Mediator–wrapper architecture
has been used to implement the system in which
existing services of Open Grid Service Architecture-
Data Access and Integration (OGSA-DAI)
middleware has been used as wrappers to provide a
standard interface to heterogeneous data resources.
A distributed query processor (DQP) has been
implemented using extensibility points of it to serve
as a mediator that provides a global view of wrapped
data sources and supports execution of distributed
queries in parallel. The frame work has three main
parts: data provider layer; Data Grid infrastructure
and a user interfacing portal.
