1. A computer-implemented method comprising: arranging a plurality of arrays of counters in layers to associate the plurality of arrays with a plurality of predefined time intervals; referencing the plurality of arrays of counters with a plurality of pointers; and maintaining an index to provide time-based management of the plurality of arrays of counters, the index comprising a timestamp and the plurality of pointers, each of the plurality of pointers logically pointing to a distinct one of the plurality of arrays.