QoS-Oriented Grid-Enabled Data Warehouses - Data Warehousing Design and Advanced Engineering Applications - page 151

Chapter 9
QoS-Oriented Grid-Enabled
Data Warehouses

Rogério Luís de Carvalho Costa
University of Coimbra, Portugal

Pedro Furtado
University of Coimbra, Portugal

ABSTRACT

Globally accessible data warehouses are useful in many commercial and scientific organizations. For
instance, research centers can be put together through a grid infrastructure in order to form a large
virtual organization with a huge virtual data warehouse, which should be transparently and efficiently
queried by grid participants. As it is frequent in the grid environment, in the Grid-based Data Warehouse
one can both have resource constraints and establish Service Level Objectives (SLOs), providing some
Quality of Service (QoS) differentiation for each group of users, participant organizations or requested
operations. In this work, we discuss query scheduling and data placement in the grid-based data ware-
house, proposing the use of QoS-aware strategies. There are some works on parallel and distributed data
warehouses, but most do not concern the grid environment and those which do so, use best-effort oriented
strategies. Our experimental results show the importance and effectiveness of proposed strategies.

INTRODUCTION clusters, storage systems and networks (Foster,

2001). In Data Grids , the infrastructure is used to
coordinate the storage of huge volumes of data or
the distributed execution of jobs which consume or
generate large volumes of data (Krauter et al, 2002;
Venugopal et al, 2006). Most of the works on data
grids considers the use or management of large files,
but grid-enabled Database Management Systems
(DBMS) may be highly useful in several applica-

In the last few years, Grid technology became a
key component in many widely distributed appli-
cations from distinct domains, which include both
research-oriented and business-related projects. The
Grid is used as an underlying infrastructure that
provides transparent access to shared and distrib-
uted resources, like supercomputers, workstation