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Oracle WebLogic Server 11g Administration Handbook by Sam Alapati

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Introduction to WebLogic Server Clusters

When you create a domain with multiple Managed Servers, all those servers function independent of each other. A cluster, on the other hand, is a group of WebLogic Server instances that work as a single instance from the point of view of a client. The reason you use a cluster is to increase scalability and reliability by taking advantage of a cluster's workload balancing and failover capabilities that you can't have with a single server instance. You manage clustered server instances the same as any nonclustered instance. Of course, to avail yourself of the load-balancing and failover capabilities of a cluster, you must configure a few other things as well.

You use clusters to achieve two important goals: ...

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