oracle database gateway - ghdrako/doc_snipets GitHub Wiki
- https://aws.amazon.com/blogs/database/using-an-oracle-database-gateway-to-connect-amazon-rds-custom-for-oracle-to-postgresql/
- https://blog.dataconsulting.pl/articles/oracle-database-gateways/
- https://forums.oracle.com/ords/apexds/post/creating-link-between-oracle-and-postgres-databases-3344
- https://kb.oakland.edu/uts/OracleGatewayToPostgreSQL