Installation Oracle database SW release 19c: execution of root.sh when Oracle 12c environment exists
Since we plan to upgrade our productional environment to Oracle 19c (release 19.8.0.0) we need to install the Oracle database software for 19c on hosts which already contain an Oracle 12c environment. The Oracle database software for 12c (release 12.2.0.1.0) is installed under ORACLE_HOME "/opt/oracle84/product/12.2.0/dbhome_1". The ORACLE_BASE directory is defined as "/opt/oracle84". On these hosts are running several databases (Standalone, Primary-/Standby). Now it's planned to install the Oracle database software 19c on these hosts. The ORACLE_HOME will be "/opt/oracle84/product/19.8.0/dbhome_1" - as you can see will this be a parallel directory to the already installed ORACLE_HOME for Oracle 12c. The ORACLE_BASE