Starting with Oracle Database 18c, you can configure an Oracle home in read-only mode.
A read-only Oracle home simplifies provisioning by implementing separation of installation and configuration.
In a read-only Oracle home, all the configuration data and log files reside outside of the read-only Oracle home.
Apart from the traditional ORACLE_BASE and ORACLE_HOME directories, the following directories contain files that used to be in ORACLE_HOME:
Note:This feature does not affect how database administrators monitor, diagnose, and tune their system performance.