Oracle Rolling Upgrade using DBMS_ROLLING 12 to 19c

Oracle step by step upgrade from 12c to 19c using DBMS_ROLLING , this is rolling upgrade ( zero downtime ) , but need active data guard license .

[@mrbushlied7742]

Excellent presentation! I shall upgrade a test 12.2.0 instance along with its standby to Oracle 19.22 now.