Very possible. I learned about the possibility a good decade ago when working on Oracle. For high performance use we used to have two areas: - one small SSD-b

Very possible. I learned about the possibility a good decade ago when working on Oracle. For high performance use we used to have two areas: - one small SSD-backed area where new inserts happened (Server class SSD was new and relatively expensive back then.) - one (or more) areas for permanent storage, based on ordinary disks with good storage/price Then we had processes that processed data from the SSD Pool and wrote them to long term storage asynchronously. Edit: I should say I was very happy to find the same feature on Postgres, Oracle is a real hassle in more than one way.