Solution : https://service.sap.com/sap/support/notes/168243 (SAP Service marketplace login required)
Key words :
orapwd file=$oracle_home/dbs/orapw password=<passwd> entries=10 5, $oracle_home/dbs/init<sid>, terms connect internalsysopersysdba reason, operating system group 'dba', allocating sysoper/sysdba authorization, connect sys/<passwd>, operating system level, aconnect <username>/<password>, connect <username>/<password>, ora_<sid>_dba
Related Notes :
| 480266 | Problems with the SYSDBA/SYSOPER/INTERNAL connect |