Hi,
As suggested previously the mentioned datbase upgrade guide is available on the SAP Service
Marketplace as also described in SAP Note 1914631.
You may also refer to below SAP Notes for more information:
1914631 - "Central Technical Note for Oracle Database 12c Release 1 (12.1)"
2133079 - "Oracle Database 12c: Integration in SAP environment"
1915299 - "Troubleshooting Software Installation for 12.1.0.2"
2086029 - "Oracle 12c: Additional Info / Corrections to Oracle 12c (12.1.0.2) Upgrade"
Regards,
Bíborka
