working with arcgis 10.1 and oracle 18.104.22.168, getting following error..
Failed to connect to databaseThis release of Geodatabase is either invalid or out of dateDBMS table not found ora-00942 table or view does not exist sde.gdb_release
Please see these links to help troubleshoot,
Hope this helps,
I don't use Oracle, but here are the system requirements for 10.1 for relational databases (including Oracle)