OBIEE 18.104.22.168 installation fails with the error message
64254: Encountered error: oracle.mds.exception.MDSRuntimeException: MDS-00003: error connecting to the database
java.sql.SQLException: ORA-01017: invalid username/password; logon denied
When RCU database version is Oracle 12.2 + , 18C installation will not succeed. Root cause of this issue is sec_case_sensitive_logon which is set to TRUE by default on these database version.
If we disable this property still it doessnt help installation to get succeed.