Hi
A high degree of scalability & / performance is required for any E-Business.This depends on transparent Replication, load balancing and failover. A combination of these three is called Clustering. There are 2 types of clustering.
1)Web clustering, which ensures that the Web pages that your customer is requesting (e.g.,
portfolio view, order status) are available and delivered in near real time. Web page
clustering also requires the efficient replication of the user�s transient state (e.g., the contents
of a Web shopping cart).
2)Component/object clustering, which ensures that
EJB business
services and objects (e.g., ordering & billing services, customer accounts, inventory) are both
efficient and available.
Both kinds of clustering are essential for delivering mission-critical information
systems over the Web
Hope it helps
Suneel
[This message has been edited by Suneel Setlur (edited March 08, 2001).]