select @@global.myisam_recover_options;
@@global.myisam_recover_options
OFF
select @@session.myisam_recover_options;
ERROR HY000: Variable 'myisam_recover_options' is a GLOBAL variable
show global variables like 'myisam_recover_options';
Variable_name	Value
myisam_recover_options	OFF
show session variables like 'myisam_recover_options';
Variable_name	Value
myisam_recover_options	OFF
select * from performance_schema.global_variables where variable_name='myisam_recover_options';
VARIABLE_NAME	VARIABLE_VALUE
myisam_recover_options	OFF
select * from performance_schema.session_variables where variable_name='myisam_recover_options';
VARIABLE_NAME	VARIABLE_VALUE
myisam_recover_options	OFF
set global myisam_recover_options=1;
ERROR HY000: Variable 'myisam_recover_options' is a read only variable
set session myisam_recover_options=1;
ERROR HY000: Variable 'myisam_recover_options' is a read only variable