Which is better, to have a HashMap with large number of records or k number of small HashMaps in Java?

Question

MONGODB 3.2.8, WIREDTIGER STORAGE ENGINE
SINGLE COLLECTION HAS MORE THAN 500G, WHETHER IT NEEDS TO BE SEPARATED?

WHAT PARAMETER SHOULD BE ADJUSTED ?

Answer 1

It depends on the different scenarios on which hashmap is used:-
1. If the objects in the hashMap are same then there is no point in having different hashmap as the traverse time in a hashmap is invariant to the size of the Map.
2.If the objects are of different type like one of Car class , other of Truck class etc then also one can have single hashmap but different hashmap would score over it as it increasesreadability of the code.