Upgrade Techniques
https://www.oracle.com/a/tech/docs/twp-upgrade-oracle-database-19c.pdf
Browsing: Upgrade
Upgrade from R12.1.1 to R12.1.3
Here are the steps to upgrade from R12.1.1 to R12.1.3
Upgrade from_R12.2 to R12.2.7
Here are the steps to upgrade from R12.2. to R12.2.7 using startCD 51