The Oracle Management Infrstructure consists of 3 components.
Oracle Enterprise Manager Grid Control
This consists of one or more Oracle Management Servers(OMS) and a repository database.
It communicates to Oracle Agents which are installed on each host in the Grid.
Oracle Internet Directory
This resides in an Oracle Application Server in the Infrastructure install.
Replication of this directory is possible and like the OMS more than one OID can use the same database repository.
Oracle Recovery Manager Catalog
Unlike the 2 above the RMAN Catalog only requires only an Oracle Database to live in.
No additonal software is required other than the Oracle Database software.
| 
