Introduction to DB Upgrades
Upgrading Oracle Database from 11.2.0.4 to 19.9.0 Using dbupgrade (Manual)
Upgrading Oracle Database from 11.2.0.4 to 19.9.0 (Using AutoUpgrade)
Upgrading and Converting 12c non-CDB as 19c PDB
Upgrading Oracle Multitenant Database from 12c/18c to 19c
Upgrading and Converting 12c non-CDB as 19c PDB (using AutoUpgrade)
Upgrading Multiple Database Versions (11g/12c/18c) to 19c Using the Single AutoUpgrade Command