It seems you would be better off using some custom in-memory data structure rather than classical ready-made database solution. You do not want to sort the who

It seems you would be better off using some custom in-memory data structure rather than classical ready-made database solution. You do not want to sort the whole dataset after each new piece of data comes. You want to insert each new entry right into its place (probably via some hashing). If, of course, it is possible. Too little details about what you want to do with the aggregate data.