| Oracle Enterprise Manager v2.x Architecture |
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| Databases - Oracle Enterprise Manager |
 Oracle Enterprise Manager has a three tier architecture comprising the first tier Console, the middle tier Management Server and the third tier comprising of the managed targets such as Nodes, database, and other services. Again the Management Server can be installed and configured on additional machines, should the need arise. The type of Architecture you wish to deploy depends on the specific requirements of your business. You can deploy the Console, OMS, and the managed targets on separate machines or on the same machine. This depends on several factors such as workload, load balancing issues, sharing between Administrators etc. Select a deployment method that best suits your requirement.  The Console helps the users to manage administrative tasks in a database through a graphical interface. Through the Console, the users can perform tasks to manage databases, nodes, and other services. The Console functions through the Oracle Management Server (OMS) and does not interact directly with the managed nodes. However, in Enterprise Manager Release 9.x, the Console can be logged into the database directly without the OMS. The OMS acts as a link between the Console and the managed Nodes. It performs several functions relating to jobs and events. The OMS receives the input from the Console and sends it to the Intelligent Agent residing on the managed nodes. The OMS is scaleable; as the workload increases, configure OMS on additional machines. However, only one OMS can be set up per machine. Before configuring additional OMS, ensure that the Management Server component has been installed. The OMS uses a Repository, which is a set of tables in a database, to store all information received from the Console and the Nodes. The Repository is created using Enterprise Manager Configuration Assistant (EMCA) and it configures the OMS. Refer to Configure OMS section for more details on configuring a repository. The third tier comprises of the databases, nodes, and other services. An Intelligent Agent resides in the managed node and there can only be one Agent one a machine. The Agent is not dependent on either the database or the OMS and functions independently. Hence, the Agent can be up and running even though the database or the OMS is down. The OMS sends the requisite information to the Intelligent Agent residing on the node and it is the function of the Agent to execute the jobs and events sent by the OMS. After executing the tasks requested by the OMS, information is sent by the Agent to the OMS. The OMS in turn sends it back to the Console. Refer to the Command Line section for starting and stopping various services.
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