A method of storing data is disclosed. The method is performed on a data storage server having one or more processors and memory storing one or more programs for execution by the one or more processors. The data storage server receives a first and second data request, the requests including a first and second range of one or more keys and an associated first and second value respectively. The data storage server identifies one or more overlap points associated with the first range and the second range. For each of the overlap points, the data storage server then creates data items including ranges of keys, the ranges of each data item including one or more keys that are either: (a) the keys between a terminal key of the first or second range and the overlap point, or (b) the keys between two adjacent overlap points.