register mib

Could anyone tell me the purpose/use of the following handler registration method? 
  netsnmp_mib_handler *handler1 = netsnmp_create_handler("", handle_snmp); 
  netsnmp_register_handler_by_name("", handler1); 

Instead of the usual registration method: 
  netsnmp_handler_registration *handler_reg = 
       netsnmp_create_handler_registration("", 
             handle_snmp, 
             scalar_oid, 
             oid_length, 
             HANDLER_CAN_RONLY); 
  int returnValue = netsnmp_register_scalar(handler_reg); 


I have been asked if it is possible to register all scalars under a root node recursive. This instead of registering all scalars one by one. The only approach I have found is to register scalar groups with netsnmp_register_scalar_group, but that one needs to be invoked for each scalar group. With my current approach of registering 4000 scalars one by on it takes a few minutes and snmpd uses a lot of CPU in that time. By registering scalar groups consumed time and CPU load of snmpd wasn't any different. 

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