changing value of system variable (1 reply)

i want to change the value of lower_case_table_names variable from 0 to 1.
when i am writing

set global lower_case_table_names=1;

it is showing unknown system variable. it i am replacing the global keyword with session then also the same result.

if i am writing set @lower_case_table_names=0;
it is executing without error but not changing the value.

I am also not able to find the my.cnf file.

please it is urgent.

regards