The Oracle Installation User can be either a local user or a domain user.

To install the Oracle Grid Infrastructure or Oracle Database software, you must use either a local or domain user. In either case, the Oracle Installation User must be an explicit member of the Administrators group on all nodes of the cluster.

If you use a local user account for installing Oracle Grid Infrastructure or Oracle Real Application Clusters (Oracle RAC), then:

• The user account must exist on all nodes in the cluster.

• The user name and password must be the same on all nodes.

• OUI displays a warning message.

If you use a domain user account for installing Oracle Grid Infrastructure or Oracle Real Application Clusters (Oracle RAC), then:

• The domain user must be explicitly declared as a member of the local Administrators group on each node in the cluster. It is not sufficient if the domain user has inherited membership from another group.

• The user performing the installation must be in the same domain on each node. For example, you cannot have the DBADMIN\dba1 user on the first node and the RACDBA\dba1 user on the second node.

• A local user of the same name cannot exist on any of the nodes. For example if you use RACDBA\dba1 as the installation user, none of the nodes can have a local NODE1\dba1 user account.