A CDB fleet provides the database infrastructure for scalability and centralized management of many CDBs.
Designate a fleet member by setting the
LEAD_CDB_URIdatabase property to a database link that points to the lead CDB.
You must use a database link with fixed user semantics, which means that the user name and password are in the link definition. The link cannot use connected user semantics, in which case the user name and password are not in the link definition.