Oracle : Ошибка ORA-08231

"smscre: unable to attach to SGA"
*Cause: The process cannot attach to the SGA. This can happen if either
the listener can't attach, or the process cannot communicate
with the listener.
*Action: Verify that the instance is up and running. Contact your
customer support representative.

Попробовать перевести

Поискать эту ошибку на форуме