By Juergenkress-Oracle on Apr 23, 2013
Learn to take advantage of multiple Oracle WebLogic Server instances grouped into a cluster to maximize scalability and availability.
The key characteristics of a successful online system today include high availability, reliability, and scalability. Put simply, your online system must be ready to process a user request quickly and at any time, even when the number of requests grows abruptly. Strictly speaking, a growing number of user requests is a good thing, because that makes it clear that your online business is booming and opening up new opportunities for you. The ability to act on opportunities is a key characteristic of many successful businesses today.
To meet the requirements for greater availability and scalability, more and more companies are moving toward clustered infrastructures for their online solutions. Oracle WebLogic Server supports clustering, allowing an Oracle WebLogic Server cluster to be composed of multiple Oracle WebLogic Server instances running on different servers at the same time, so that application deployed to the cluster can take advantage of the combined processing power of multiple servers, failover, and load balancing.
To end users and applications, multiple Oracle WebLogic Server instances grouped into a cluster appear as a single Oracle WebLogic Server instance. But beneath the surface, the cluster uses an infrastructure that enables interconnecting clustered Oracle WebLogic Server instances to make them work as a single unit. It's important to realize, though, that setting up and using that infrastructure involves some configuration work on the part of a cluster administrator.
Key Benefits of Clustering
The idea behind clustering is pretty simple: Multiple server instances are grouped to work together to achieve increased scalability and reliability. In particular, the benefits of an Oracle WebLogic Server cluster include the following:
- High availability - You can deploy your applications on multiple server instances within an Oracle WebLogic Server cluster. In this case, if a server instance that is running your application fails, application processing will continue (transparently to the application users) on another instance.
- Scalability - New server instances can be dynamically added to a cluster to match consumer demand, without interrupting application processing.
- Improved performance - Another advantage to deploying on multiple server instances in a cluster is that it provides several alternatives for application processing. The load balancing mechanism that clustering enables can significantly improve performance of your clustered application due to the efficient distribution of jobs and communications across the resources within the cluster.
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