Read Oracle documentation for better understanding.
You use the DB_SITE handle to configure and manage replication sites.
Returns a replication site’s network address. That is, this method returns a tuple with the site’s hostname and port. More info…
Removes the site from the replication group. If called at the master site, repmgr updates the membership database directly. If called from a client, this method causes a request to be sent to the master to perform the operation. The method then awaits confirmation. More info…