How you organize your WebLogic Server installations into domains depends on your business needs. You can define multiple domains based on different system administrators' responsibilities, application boundaries, or geographical locations of the machines on which servers run. Conversely, you might decide to use a single domain to centralize all WebLogic Server administration activities.
Depending on your particular business needs and system administration practices, you might decide to organize your domains based on criteria such as:
Logical divisions of applications. For example, you might have one domain devoted to end-user functions such as shopping carts and another domain devoted to back-end accounting applications.
Physical location. You might establish separate domains for different locations or branches of your business.
Size. You might find that domains organized in small units that can be managed more efficiently, perhaps by different system administrators. Contrarily, you might find that maintaining a single domain or a small number of domains makes it easier to maintain a consistent configuration.
A domain can consist of an Administration Server and one or more Managed Servers, or of a single standalone server that both acts as Administration Server and runs deployed applications.
Domain with Separate Managed Servers: A simple production environment can consist of a domain with several Managed Servers that host applications, and an Administration Server to perform management operations. In this configuration, applications and resources are deployed to individual Managed Servers; similarly, clients that access the application connect to an individual Managed Server.
Production environments that require increased application performance, throughput, or availability should configure two or more of Managed Servers as a cluster. Clustering allows multiple Managed Servers to operate as a single unit to host applications and resources. For more information about the difference between standalone and clustered Managed Servers, see Managed Servers and Managed Server Clusters.
Standalone Server Domain: For development or test environments, you may want to deploy a single application and server independently from servers in a production domain. In this case, you can deploy a simple domain consisting of a single server instance that acts as an Administration Server that, and also hosts the applications you are developing. The wl_server domain that you can install with WebLogic Server is an example of a standalone server domain.
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