The Colloquium Series of the
            Department of Computer Science,
		  University of Wyoming

			presents

                  Dr. Khuzaima Daudjee

                 University of Waterloo

   "Scalable Data Replication with Freshness Guarantees" 
 
                Thursday, March 22, 2007
                        EN 1062
                    4:00 - 5:00 p.m.

Abstract:

In recent years, a variety of new applications have emerged that allow
access to data from around the globe.  Telecommunication-based and 
web-based applications such as e-commerce have gained enormous popularity.
Replication can be used to provide good performance and availability by 
distributing the load and increasing resources in the system as it 
services transactional requests from these applications.  However, the 
presence of multiple copies of data (or replicas) poses some key challenges.
For example, when one replica is updated, the other replicas become stale.
Moreover, if updates are not applied in the same order to replicas of a 
data item, the copies become inconsistent.  In this talk, I will present
techniques for providing consistency and transactional freshness guarantees
for replicated data while allowing the system to scale.