QoS-Oriented Grid-Enabled Data Warehouses - Data Warehousing Design and Advanced Engineering Applications - page 166

Figure 9. Number of replicas per facts table fragment - hierarchical topology

of pending work. But such sites take too much
time to execute a query, and the Community
Scheduler rarely assigns query execution for such
sites. Therefore, the replicas created by DLL were
somehow of less utility to the system.

ently queried by the organizations participant's.
In such environment, the Grid is used as basic
infrastructure for the deployment of a large dis-
tributed mostly read-only database. But due to
the grid's special characteristics, like resource
heterogeneity, geographical dispersion and site
autonomy, the efficient deployment of huge data
warehouses over grid-connected sites is a special
challenge.
In this chapter, we present QoS-oriented
scheduling and distributed data placement strat-
egies for the grid-based warehouse. We discuss

CONCLUSION

Grid-based data warehouses are useful in many
global organizations which generates huge vol-
umes of distributed data that should be transpar-

Figure 10. Number of facts table fragments at each site in hierarchical topology