Hi Rohit

You just need to set the database connection parameters in the Odoo config like:

db_host = 127.0.0.1
db_port = 5432
db_user = odoo
db_password = odoo

See more about it here:

https://www.odoo.com/documentation/9.0/reference/cmdline.html#database

Those command line arguments have their correspondent config option as explained here:

https://www.odoo.com/documentation/9.0/reference/cmdline.html#configuration-file