I have some sensitive data I wish to install in an Oracle 18c XE database on Windows in a way that only a specific oracle user with a specific password of my choosing can acces the data. I've googled around and not found any information at all really. TDE looks really nice, passwords can be changed etc. But in the end, the user that installed the database can use 'sqlplus / as sysdba' to turn it all around, or even orapwd.exe I guess.
Is Oracle databases in general not appropriate for installation/usage in such a hostile environment or am I missing someting?