1select @@global.ft_max_word_len; 2@@global.ft_max_word_len 384 4select @@session.ft_max_word_len; 5ERROR HY000: Variable 'ft_max_word_len' is a GLOBAL variable 6show global variables like 'ft_max_word_len'; 7Variable_name Value 8ft_max_word_len 84 9show session variables like 'ft_max_word_len'; 10Variable_name Value 11ft_max_word_len 84 12select * from information_schema.global_variables where variable_name='ft_max_word_len'; 13VARIABLE_NAME VARIABLE_VALUE 14FT_MAX_WORD_LEN 84 15select * from information_schema.session_variables where variable_name='ft_max_word_len'; 16VARIABLE_NAME VARIABLE_VALUE 17FT_MAX_WORD_LEN 84 18set global ft_max_word_len=1; 19ERROR HY000: Variable 'ft_max_word_len' is a read only variable 20set session ft_max_word_len=1; 21ERROR HY000: Variable 'ft_max_word_len' is a read only variable 22