This would be an extremely unusual case but I can't find additional documentation on it. If
you have set the Lock For parameter to indefinitely and I have locked down the
SYSTEM user, is it possible if the system is hacked or manually to lock
all the logins? If so what is the correct solution resolve the issue.
This is possible in other DBMS and there is usually a
backdoor if all the logins get locked. I understand that SYSTEM doesn’t
participate in max failed logins but I believe it’s a best practice to
lock SYSTEM manually once the DBA logins are created.