How to set db cfg to empty value

How to set a DB2 LUW database cfg value to an  empty value use NULL.

note : It’s case sensitive. Using “null” will not work.

 An example of setting NULL:

update db cfg for MYDB using HADR_LOCAL_HOST  NULL

Not all DB2 db cfg items can be set to NULL. Every parameter has a set of valid values  from docs "USING config-keyword valueconfig-keyword specifies the database configuration parameter to be updated. value specifies the value to be assigned to the parameter" 

Check the documentation for the individual configurable