1select @@global.relay_log_space_limit; 2@@global.relay_log_space_limit 30 4select @@session.relay_log_space_limit; 5ERROR HY000: Variable 'relay_log_space_limit' is a GLOBAL variable 6show global variables like 'relay_log_space_limit'; 7Variable_name Value 8relay_log_space_limit 0 9show session variables like 'relay_log_space_limit'; 10Variable_name Value 11relay_log_space_limit 0 12select * from information_schema.global_variables where variable_name='relay_log_space_limit'; 13VARIABLE_NAME VARIABLE_VALUE 14RELAY_LOG_SPACE_LIMIT 0 15select * from information_schema.session_variables where variable_name='relay_log_space_limit'; 16VARIABLE_NAME VARIABLE_VALUE 17RELAY_LOG_SPACE_LIMIT 0 18set global relay_log_space_limit=1; 19ERROR HY000: Variable 'relay_log_space_limit' is a read only variable 20set session relay_log_space_limit=1; 21ERROR HY000: Variable 'relay_log_space_limit' is a read only variable 22