Hi Luis,
If you are SAP customer, you can find it from below links in service market place:
https://websmp202.sap-ag.de/~sapidb/012002523100005235232015E/Ora_DB_Upgr_UX_121__00.pdf
https://websmp202.sap-ag.de/~sapidb/012002523100005235242015E/Ora_DB_Upgr_Win_121__00.pdf
One is from Unix and the other one is for windows.
Best regards,
James