# GLOBAL scope
SELECT @@GLOBAL.master_info_file;
@@GLOBAL.master_info_file
30189.info
SELECT @@master_info_file;
@@master_info_file
30189.info
# Not SESSION scope
SELECT @@SESSION.master_info_file;
ERROR HY000: Variable 'master_info_file' is a GLOBAL variable
# Read-only
SET @@master_info_file= 'master.info';
ERROR HY000: Variable 'master_info_file' is a read only variable
SET @@GLOBAL.master_info_file= 'master.info';
ERROR HY000: Variable 'master_info_file' is a read only variable
SET @@SESSION.master_info_file= 'master.info';
ERROR HY000: Variable 'master_info_file' is a read only variable