LDAP and oracle

Hi, We just migrated our unix/linux accounts to LDAP. We decided to migrate every user account that can login (except root) to LDAP. Now we have heavy load on our LDAP systems and I think this is because we also migrated the oracle users that are running our oracle databases. This is because the oracle admins log on the systems using the user the database is running with. I do not know that much about oracle but is it mandatory to administrate an oracle database with the same user? Does it make sense to migrate systemusers to ldap?

Florian Engelmann