hello,
it seems that maybe the BD is full check the tablespaces used percentage (normally PSAPTEMP and PSAPUNDO goes full). Also if you applied any patch on oracle database does it ended succesfully?
Check R3trans -d with sidadm user, also you can check R3load -testconnect. Don't forget to update all this tools DB Shared lib, R3load, R3ldctl and R3szchk.
Let me know how it goes.
Regards,
Michael