The "API" is doable. Being binary compatible is not at all. Oracle DB is complex because of historical choices (the patch picking, compatibility flags) etc... i

The "API" is doable. Being binary compatible is not at all. Oracle DB is complex because of historical choices (the patch picking, compatibility flags) etc... inbuilt JVM and PL/SQL. Those things that make working on OracleDB today difficult is what made it so dependable for people with money in the last 20 years. It also runs on a lot of architectures that today's software is not really running on anymore.