1select @@global.init_file; 2@@global.init_file 3NULL 4select @@session.init_file; 5ERROR HY000: Variable 'init_file' is a GLOBAL variable 6show global variables like 'init_file'; 7Variable_name Value 8init_file 9show session variables like 'init_file'; 10Variable_name Value 11init_file 12select * from information_schema.global_variables where variable_name='init_file'; 13VARIABLE_NAME VARIABLE_VALUE 14INIT_FILE 15select * from information_schema.session_variables where variable_name='init_file'; 16VARIABLE_NAME VARIABLE_VALUE 17INIT_FILE 18set global init_file=1; 19ERROR HY000: Variable 'init_file' is a read only variable 20set session init_file=1; 21ERROR HY000: Variable 'init_file' is a read only variable 22