1select @@global.relay_log_info_file; 2@@global.relay_log_info_file 3relay-log.info 4select @@session.relay_log_info_file; 5ERROR HY000: Variable 'relay_log_info_file' is a GLOBAL variable 6show global variables like 'relay_log_info_file'; 7Variable_name Value 8relay_log_info_file relay-log.info 9show session variables like 'relay_log_info_file'; 10Variable_name Value 11relay_log_info_file relay-log.info 12select * from information_schema.global_variables where variable_name='relay_log_info_file'; 13VARIABLE_NAME VARIABLE_VALUE 14RELAY_LOG_INFO_FILE relay-log.info 15select * from information_schema.session_variables where variable_name='relay_log_info_file'; 16VARIABLE_NAME VARIABLE_VALUE 17RELAY_LOG_INFO_FILE relay-log.info 18set global relay_log_info_file=1; 19ERROR HY000: Variable 'relay_log_info_file' is a read only variable 20set session relay_log_info_file=1; 21ERROR HY000: Variable 'relay_log_info_file' is a read only variable 22