select @@global.lower_case_file_system=2; @@global.lower_case_file_system=2 0 select @@session.lower_case_file_system; ERROR HY000: Variable 'lower_case_file_system' is a GLOBAL variable SELECT @@global.lower_case_file_system in (0,1); @@global.lower_case_file_system in (0,1) 1 SELECT IF(@@global.lower_case_file_system, "ON", "OFF") = VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='lower_case_file_system'; IF(@@global.lower_case_file_system, "ON", "OFF") = VARIABLE_VALUE 1 SELECT IF(@@global.lower_case_file_system, "ON", "OFF") = VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='lower_case_file_system'; IF(@@global.lower_case_file_system, "ON", "OFF") = VARIABLE_VALUE 1 set global lower_case_file_system=1; ERROR HY000: Variable 'lower_case_file_system' is a read only variable set session lower_case_file_system=1; ERROR HY000: Variable 'lower_case_file_system' is a read only variable