This page can help you: https://www.dataiku.com/learn/guide/getting-started/dss-concepts/where-does-it-all-happen.html You can also have a look at the reference documentation (of Spark for example): https://doc.dataiku.com/dss/latest/spark/usage.html
Yes. I could see when I change storage system to PostgreSQL then engine moved to run in SQL. Also there is settings icon where we can change the engine. Wonderlly DATAIKU choose its fastest engine accordingly.