Solution : https://service.sap.com/sap/support/notes/395514 (SAP Service marketplace login required)
Key words :
/var/opt directory, ora file exists, symptom ora-1034, configuration file, file listener, file correspondingly, upgrade/migration, solution due, sqlnet listener, oracle checks
Related Notes :
| 491174 | Composite SAP note for ORA-01034 |
| 362068 | Supplement to Oracle migration/upgrade to 8.1.7: UNIX |