Oracle : Ошибка ORA-16638

"could not obtain instance status"
*Cause: The broker could not determine whether the specified instance was
*Action: See the next error message in the error stack for more detailed
information. If the situation described in the next error in the
stack can be corrected, do so; otherwise, contact Oracle Support

Попробовать перевести

Поискать эту ошибку на форуме