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