There are two reasons several of my clients have chosen Oracle over Postgres. #1: Training. Oracle does training very well. If need new DBAs in-house (for secu

There are two reasons several of my clients have chosen Oracle over Postgres. #1: Training. Oracle does training very well. If need new DBAs in-house (for security reasons etc), they got huge array of options available. The most effective options are also insanely expensive. Once paid 400k€ to get two new DBAs. They became very good at it. #2: Clustering. Postgres is nowhere near what Oracle offers. Even with the newest releases. What Oracle offers is real multi-master synchronized replication with proper distributed locks, low latency, and it's maintainable and easy to setup. Postgres has still 5-10 years to do before they will reach feature parity on today's Oracle.