DBConvert/ DBSync software assists with conversion and synchronization of your data from Oracle to PostgreSQL / Amazon RDS PostgreSQL / Heroku Postgres instances. In case you have no direct connection to PostgreSQL, you can use Dump files and PHP scripts as a target.
A bunch of options available for migration at the configuration step in GUI wizard like interface. Command line mode to automate migration tasks is available for DBConvert/ DBSync for Oracle and MySQL as well.
It takes about 4-7 minutes for migrating 1 Million of records.