SET @start_global_value = @@global.aria_recover_options;
set @@global.aria_recover_options=default;
select @@global.aria_recover_options;
@@global.aria_recover_options
BACKUP,QUICK
select @@session.aria_recover_options;
ERROR HY000: Variable 'aria_recover_options' is a GLOBAL variable
show global variables like 'aria_recover_options';
Variable_name	Value
aria_recover_options	BACKUP,QUICK
show session variables like 'aria_recover_options';
Variable_name	Value
aria_recover_options	BACKUP,QUICK
select * from information_schema.global_variables where variable_name='aria_recover_options';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_RECOVER_OPTIONS	BACKUP,QUICK
select * from information_schema.session_variables where variable_name='aria_recover_options';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_RECOVER_OPTIONS	BACKUP,QUICK
set global aria_recover_options=1;
select @@global.aria_recover_options;
@@global.aria_recover_options
NORMAL
set session aria_recover_options=1;
ERROR HY000: Variable 'aria_recover_options' is a GLOBAL variable and should be set with SET GLOBAL
set global aria_recover_options=normal;
select @@global.aria_recover_options;
@@global.aria_recover_options
NORMAL
set global aria_recover_options=backup;
select @@global.aria_recover_options;
@@global.aria_recover_options
BACKUP
set global aria_recover_options='force';
select @@global.aria_recover_options;
@@global.aria_recover_options
FORCE
set global aria_recover_options=off;
select @@global.aria_recover_options;
@@global.aria_recover_options
OFF
set global aria_recover_options='quick,force';
select @@global.aria_recover_options;
@@global.aria_recover_options
FORCE,QUICK
set global aria_recover_options=16;
select @@global.aria_recover_options;
@@global.aria_recover_options
OFF
set global aria_recover_options=1.1;
ERROR 42000: Incorrect argument type to variable 'aria_recover_options'
set global aria_recover_options=1e1;
ERROR 42000: Incorrect argument type to variable 'aria_recover_options'
set global aria_recover_options="foo";
ERROR 42000: Variable 'aria_recover_options' can't be set to the value of 'foo'
set global aria_recover_options=32;
ERROR 42000: Variable 'aria_recover_options' can't be set to the value of '32'
SET @@global.aria_recover_options = @start_global_value;