In this video, we are going to look at Oracle Weblogic Clusters and Dynamic Cluster.
For those who are new, A WebLogic Server cluster consists of multiple WebLogic Server server instances running simultaneously and working together to provide increased scalability and reliability. To know in detail about Weblogic Clusters and Dynamic Cluster, go through the video below.
If you are a beginner and want to learn Oracle Weblogic Server Administration then check our blog post here, where we covered Weblogic Admin Server and Managed Server.
What is a Weblogic Cluster:
- 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.
- There are two types of Cluster Communication i.e 1.Unicast 2.Multicast
What are the Benefits of Clustering?
A WebLogic Server cluster provides these benefits:
Scalability: The capacity of an application deployed on a WebLogic Server cluster can be increased dynamically to meet demand. You can add server instances to a cluster without interruption of service—the application continues to run without impact to clients and end users.
High-Availability: In a WebLogic Server cluster, application processing can continue when a server instance fails. You “cluster” application components by deploying them on multiple server instances in the cluster—so, if a server instance on which a component is running fails, another server instance on which that component is deployed can continue application processing.
The choice to cluster WebLogic Server instances is transparent to application developers and clients. However, understanding the technical infrastructure that enables clustering will help programmers and administrators maximize the scalability and availability of their applications.
What is a Dynamic Cluster(12c) :
- WebLogic Server 12c has an existing new feature called Dynamic Clustering.
- A Dynamic Cluster contains multiple dynamic servers that are based on a single server template.
- The Servers in Dynamically scaled up based on Application Need.
- It Uses Server Template to define the configuration of Servers, part of Dynamic Cluster.
- WebLogic Server that gets created from Server Template and Dynamic Cluster creates these Dynamic Servers.
So this is all in nutshell about Oracle Weblogic Clusters and Dynamic Cluster. Please go through the video to know in detail.
We cover this in one of the modules of our Oracle WebLogic Training, where we also cover Architecture, File System, JDBC, JMS, HA, Clustering, Security, Patching, Upgrade, Backup, and Recovery etc.
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