Oracle Enterprise Manager Comes In 3 Flavors
-Database control
-Grid control
-Cloud control
Database Control: Using database control you can manage only one database. If you want to administer more than one database, then you must configure a seperate database control (OEM) for each database, otherwise you can go for grid/cloud control configuration.
Grid control: Using grid control you can monitor you whole infrastructure; i.e. you can manage more that one databases. Grid control is responsible for monitoring all targets and collects information on the Oracle databases, application servers, listeners hardware, operation system and third party softwares. Grid control is now obsolete.
Cloud control: cloud control is the latest release to manage and monitor multiple hosts, it provides much better management features for entire oracle and non-oracle databases.
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