SET @start_global_value = @@global.innodb_ft_aux_table; SELECT @start_global_value; @start_global_value NULL select @@session.innodb_ft_aux_table; ERROR HY000: Variable 'innodb_ft_aux_table' is a GLOBAL variable show global variables like 'innodb_ft_aux_table'; Variable_name Value innodb_ft_aux_table show session variables like 'innodb_ft_aux_table'; Variable_name Value innodb_ft_aux_table select * from information_schema.global_variables where variable_name='innodb_ft_aux_table'; VARIABLE_NAME VARIABLE_VALUE INNODB_FT_AUX_TABLE select * from information_schema.session_variables where variable_name='innodb_ft_aux_table'; VARIABLE_NAME VARIABLE_VALUE INNODB_FT_AUX_TABLE set session innodb_ft_aux_table='Salmon'; ERROR HY000: Variable 'innodb_ft_aux_table' is a GLOBAL variable and should be set with SET GLOBAL set @@session.innodb_ft_aux_table='Salmon'; ERROR HY000: Variable 'innodb_ft_aux_table' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_ft_aux_table=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_ft_aux_table' set global innodb_ft_aux_table=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_ft_aux_table' set global innodb_ft_aux_table='Salmon'; ERROR 42000: Variable 'innodb_ft_aux_table' can't be set to the value of 'Salmon' SET @@global.innodb_ft_aux_table = @start_global_value; SELECT @@global.innodb_ft_aux_table; @@global.innodb_ft_aux_table NULL