Oracle Physical Standby Database setup
The following steps can be used to setup a Oracle Physical Standby Database managed by Oracle Data Guard Broker. The software versions are: Oracle GI (Oracle Restart) and DB 19.25 and RHEL 8.1. You need to setup both nodes as described here. Afterwards patch it with RU 19.25 as described here. Delete the orcl database on the second node (see here).