Tableau Data Engine is a cool feature in Tableau. It?s an analytical database that designed to achieve instant query response, predictive performance, integrate seamlessly into existing data infrastructure, and it is not limited to load entire data sets into the memory.

If you are work with a large amount of data, it does take some time to create indexes, import, and sort data, but after that everything speeds up. Tableau Data Engine is not in-memory technology. The data is stored in disk after its import, and the RAM is hardly utilized.