What Is a WebLogic Server Cluster?

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A WebLogic Server cluster consists of multiple WebLogic Server server instances running simultaneously and working together to provide increased scalability and reliability. A cluster appears to clients to be a single WebLogic Server instance. The server instances that constitute a cluster can run on the same machine, or be located on different machines. You can increase a cluster’s capacity by adding additional server instances to the cluster on an existing machine, or you
can add machines to the cluster to host the incremental server instances. Each server instance in a cluster must run the same version of WebLogic Server.

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