SET @start_global_value = @@global.aria_sync_log_dir;
select @@global.aria_sync_log_dir;
@@global.aria_sync_log_dir
NEWFILE
select @@session.aria_sync_log_dir;
ERROR HY000: Variable 'aria_sync_log_dir' is a GLOBAL variable
show global variables like 'aria_sync_log_dir';
Variable_name	Value
aria_sync_log_dir	NEWFILE
show session variables like 'aria_sync_log_dir';
Variable_name	Value
aria_sync_log_dir	NEWFILE
select * from information_schema.global_variables where variable_name='aria_sync_log_dir';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_SYNC_LOG_DIR	NEWFILE
select * from information_schema.session_variables where variable_name='aria_sync_log_dir';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_SYNC_LOG_DIR	NEWFILE
set global aria_sync_log_dir=1;
select @@global.aria_sync_log_dir;
@@global.aria_sync_log_dir
NEWFILE
set session aria_sync_log_dir=1;
ERROR HY000: Variable 'aria_sync_log_dir' is a GLOBAL variable and should be set with SET GLOBAL
set global aria_sync_log_dir=never;
select @@global.aria_sync_log_dir;
@@global.aria_sync_log_dir
NEVER
set global aria_sync_log_dir=newfile;
select @@global.aria_sync_log_dir;
@@global.aria_sync_log_dir
NEWFILE
set global aria_sync_log_dir=always;
select @@global.aria_sync_log_dir;
@@global.aria_sync_log_dir
ALWAYS
set global aria_sync_log_dir=1.1;
ERROR 42000: Incorrect argument type to variable 'aria_sync_log_dir'
set global aria_sync_log_dir=1e1;
ERROR 42000: Incorrect argument type to variable 'aria_sync_log_dir'
set global aria_sync_log_dir="foo";
ERROR 42000: Variable 'aria_sync_log_dir' can't be set to the value of 'foo'
set global aria_sync_log_dir=3;
ERROR 42000: Variable 'aria_sync_log_dir' can't be set to the value of '3'
SET @@global.aria_sync_log_dir = @start_global_value;