NOLOGGING is not functioning

This is a part of my code. Everything is ok, no error. But I have million of lines to be inserted. I searched the internet for ways to finish my job faster.

What I found, is that insert in table using nologgin and +append, but is not working. Time to insert the same lines in table is the same even I use nologging and append.

    create or replace procedure read_files(input varchar2, extensie varchar2) as  
........................................ 
    Loop
     BEGIN
..............................
        UTL_FILE.GET_line(F1,V1);
    insert /*+ append */ into alarms(alarm_id,property_name,property_value) 
    =values(alarm_counter,f_property_name,f_property_value) ;

     End loop;
    end; 


alter table alarms nologging;
execute read_files('occ','cap');
alter table alarms logging;

Steps for my work:

• first compile the procedure
• alter table nologging
• execute procedure

Where is my mistake?