1SET @start_global_value = @@global.innodb_online_alter_log_max_size; 2SELECT @start_global_value; 3@start_global_value 4134217728 5select @@global.innodb_online_alter_log_max_size >= 524288; 6@@global.innodb_online_alter_log_max_size >= 524288 71 8select @@global.innodb_online_alter_log_max_size; 9@@global.innodb_online_alter_log_max_size 10134217728 11select @@session.innodb_online_alter_log_max_size; 12ERROR HY000: Variable 'innodb_online_alter_log_max_size' is a GLOBAL variable 13show global variables like 'innodb_online_alter_log_max_size'; 14Variable_name Value 15innodb_online_alter_log_max_size 134217728 16show session variables like 'innodb_online_alter_log_max_size'; 17Variable_name Value 18innodb_online_alter_log_max_size 134217728 19select * from information_schema.global_variables where variable_name='innodb_online_alter_log_max_size'; 20VARIABLE_NAME VARIABLE_VALUE 21INNODB_ONLINE_ALTER_LOG_MAX_SIZE 134217728 22select * from information_schema.session_variables where variable_name='innodb_online_alter_log_max_size'; 23VARIABLE_NAME VARIABLE_VALUE 24INNODB_ONLINE_ALTER_LOG_MAX_SIZE 134217728 25set global innodb_online_alter_log_max_size=1048576; 26select @@global.innodb_online_alter_log_max_size; 27@@global.innodb_online_alter_log_max_size 281048576 29select * from information_schema.global_variables where variable_name='innodb_online_alter_log_max_size'; 30VARIABLE_NAME VARIABLE_VALUE 31INNODB_ONLINE_ALTER_LOG_MAX_SIZE 1048576 32select * from information_schema.session_variables where variable_name='innodb_online_alter_log_max_size'; 33VARIABLE_NAME VARIABLE_VALUE 34INNODB_ONLINE_ALTER_LOG_MAX_SIZE 1048576 35set @@global.innodb_online_alter_log_max_size=524288; 36select @@global.innodb_online_alter_log_max_size; 37@@global.innodb_online_alter_log_max_size 38524288 39select * from information_schema.global_variables where variable_name='innodb_online_alter_log_max_size'; 40VARIABLE_NAME VARIABLE_VALUE 41INNODB_ONLINE_ALTER_LOG_MAX_SIZE 524288 42select * from information_schema.session_variables where variable_name='innodb_online_alter_log_max_size'; 43VARIABLE_NAME VARIABLE_VALUE 44INNODB_ONLINE_ALTER_LOG_MAX_SIZE 524288 45set session innodb_online_alter_log_max_size='some'; 46ERROR HY000: Variable 'innodb_online_alter_log_max_size' is a GLOBAL variable and should be set with SET GLOBAL 47set @@session.innodb_online_alter_log_max_size='some'; 48ERROR HY000: Variable 'innodb_online_alter_log_max_size' is a GLOBAL variable and should be set with SET GLOBAL 49set global innodb_online_alter_log_max_size=1.1; 50ERROR 42000: Incorrect argument type to variable 'innodb_online_alter_log_max_size' 51set global innodb_online_alter_log_max_size='foo'; 52ERROR 42000: Incorrect argument type to variable 'innodb_online_alter_log_max_size' 53set global innodb_online_alter_log_max_size=-2; 54Warnings: 55Warning 1292 Truncated incorrect innodb_online_alter_log_max_size value: '-2' 56set global innodb_online_alter_log_max_size=1e1; 57ERROR 42000: Incorrect argument type to variable 'innodb_online_alter_log_max_size' 58set global innodb_online_alter_log_max_size=2; 59Warnings: 60Warning 1292 Truncated incorrect innodb_online_alter_log_max_size value: '2' 61SET @@global.innodb_online_alter_log_max_size = @start_global_value; 62SELECT @@global.innodb_online_alter_log_max_size; 63@@global.innodb_online_alter_log_max_size 64134217728 65