If you're trading, keep it all out of the database. It won't scale and latency is terrible and unpredictable regardless of the engine. Keep the database for st

If you're trading, keep it all out of the database. It won't scale and latency is terrible and unpredictable regardless of the engine. Keep the database for storing stuff that you don't need in ram. Keep the rest in ram and message queuing/pubsub bus architecture. Plus events in a database engine are a pain in the butt to write tests against.