code: def get_namespace_statistics(self, namespace, start_offset, end_offset):
          
          cursor = self.cursor
          cursor.execute('SELECT SUM(data_points), SUM(byte_count) '
                         'FROM gauged_statistics WHERE namespace = %s '
                         'AND offset BETWEEN %s AND %s',
                         (namespace, start_offset, end_offset))
          return [long(count or 0) for count in cursor.fetchone()]
docs: Get namespace statistics for the period between start_offset and
          end_offset (inclusive)