select @@global.myisam_recover_options;
@@global.myisam_recover_options
DEFAULT
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	DEFAULT
show session variables like 'myisam_recover_options';
Variable_name	Value
myisam_recover_options	DEFAULT
select * from information_schema.global_variables where variable_name='myisam_recover_options';
VARIABLE_NAME	VARIABLE_VALUE
MYISAM_RECOVER_OPTIONS	DEFAULT
select * from information_schema.session_variables where variable_name='myisam_recover_options';
VARIABLE_NAME	VARIABLE_VALUE
MYISAM_RECOVER_OPTIONS	DEFAULT
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
