(a) What have you observed to be the fastest Load operation?
    [X] Main-memory Load. [ ] MapDB Load

(b) Why do you think that load operation was faster?
    Main memory is higher/faster on the memory hiearchy than disk.

(c) What have you observed to be the fastest Select operation?
    [ ] File Select [X] Main-memory Select. [ ] MapDB Select

(d) Why do you think that select operation was faster?
    Main memory is higher/faster on the memory hiearchy than disk.

(e) What are the benefits of using the embedded database as backend compare to the in-
memory storage?
    Much more storage is available on disk via the embedded database than in main memory.