Hey Atul, to connect your Mendix app to oracle DB locally, it's should be something like this (if you are using Oracle free and if you using some other version like Oracle 19 maybe you will need to add custom variable in tab Custom i think it's was something like OracleServiceName then your name of DB) and I about advantage i don't have any of them, but for disadvantage since Mendix is optimize to use AWS RDS postgreSQL you will lose some of performance of application