1select @@global.innodb_ft_total_cache_size; 2@@global.innodb_ft_total_cache_size 3640000000 4select @@session.innodb_ft_total_cache_size; 5ERROR HY000: Variable 'innodb_ft_total_cache_size' is a GLOBAL variable 6show global variables like 'innodb_ft_total_cache_size'; 7Variable_name Value 8innodb_ft_total_cache_size 640000000 9show session variables like 'innodb_ft_total_cache_size'; 10Variable_name Value 11innodb_ft_total_cache_size 640000000 12select * from information_schema.global_variables where variable_name='innodb_ft_total_cache_size'; 13VARIABLE_NAME VARIABLE_VALUE 14INNODB_FT_TOTAL_CACHE_SIZE 640000000 15select * from information_schema.session_variables where variable_name='innodb_ft_total_cache_size'; 16VARIABLE_NAME VARIABLE_VALUE 17INNODB_FT_TOTAL_CACHE_SIZE 640000000 18set global innodb_ft_total_cache_size=1; 19ERROR HY000: Variable 'innodb_ft_total_cache_size' is a read only variable 20set session innodb_ft_total_cache_size=1; 21ERROR HY000: Variable 'innodb_ft_total_cache_size' is a read only variable 22