What is an Oracle Home?
An oracle home is the directory structure created when an Oracle Product is installed.
What is an Oracle AS Instance?
An Oracle AS instance is the set of processes and memory structures created by running the Oracle Application Server Executable code installed into Oracle Home.One Oracle AS home can support only one Oracle AS instance.
Oracle AS instances can be in two general forms: middle-tier instances and infrastructure instances.The middle tier instances provide services to end users.Middle tier instances run application software such as Oracle Collaboration Suite. An infrastructure instances is never used directly by the end user. It provides support services to middle tier instances such as directory services, single sign on, etc.
What is an Oracle AS Farm?
An Oracle AS Farm consists of one or more middle tier instances connected to a single infrastructure instance. The infrastructure instance is therefore a single point of failure for an Oracle AS environment.
What is an Oracle AS Cluster?
A cluster is a group of one or more middle tier instances configured to run an identical set of Java Applications. Clustering is not possible in Oracle AS service other than Java applications. For eg. it is not possible to cluster a portal application. Within a cluster, any configuration change made to one instance will be automatically propogated to the other instance.
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