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About Oracle WebLogic Server Domains

Before you can develop and run a WebLogic application, you must first create a domain. A domain is an interrelated set of Oracle WebLogic Server resources that is managed as a unit. For information about creating domains, see Oracle WebLogic Server Configuration Wizard. A domain includes one or more Oracle WebLogic Server instances, which can form clusters, instances, or a combination of both. A domain can include multiple clusters. For more information about clusters, see About Oracle WebLogic Server Clusters.

A domain also contains the application components deployed in the domain and the resources and services required by those application components and the server instances in the domain. Examples of the resources and services used by applications and server instances include computer definitions, optional network channels, connectors, and startup classes. After you create a domain, you can start an Oracle WebLogic Server instance to run in the domain for developing, testing, and deploying applications.

As shown in Figure 2, an Oracle WebLogic domain consists of the following:

• One administration server
• One or more managed servers
• One or more clusters

An Oracle WebLogic domain is managed using the Oracle WebLogic Server System Administration Tools. For more information about these tools, see About System Administration Tools for Oracle WebLogic Server.

Figure 2. Structure of an Oracle WebLogic Domain

Figure 2 illustrates the structure of an Oracle WebLogic domain:

• One administration server that is managed using the Oracle WebLogic Server System Administration Tools
• One or more managed servers
• One or more clusters with one or more managed servers for each cluster