说GTID-GTID-based复制中的限制
同一个事务(语句)中,不能同时涉及事务和非事务数据表的变更,这会导致一个事务对应多个GTID,违反了事务与GTID的一对一对应原则。
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[root@MySQL.sock][db1]> show create table t2 \G
*************************** 1. row ***************************
Table: t2
Create Table: CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)
[root@mysql.sock][db1]> start transaction;
Query OK, 0 rows affected (0.00 sec)
[root@mysql.sock][db1]> insert into t1 select null;
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
[root@mysql.sock][db1]> insert into t2 select null;
ERROR 1785 (HY000): Statement violates GTID consistency: Updates to non-transactional tables can only be done in either autocommitted statements or single-statement transactions, and never in the same statement as updates to transactional tables.
[root@mysql.sock][db1]> commit;
Query OK, 0 rows affected (0.01 sec)
不能使用CREATE TABLE ... SELECT语句。
[root@mysql.sock][db1]> create table t2 select * from t2;
ERROR 1786 (HY000): Statement violates GTID consistency: CREATE TABLE ... SELECT.
在事务,存储过程,函数和触发器中,不能使用CREATE TEMPORARY TABLE,和DROP TEMPORARY TABLE语句。
[root@mysql.sock][db1]> start transaction;
Query OK, 0 rows affected (0.00 sec)
[root@mysql.sock][db1]> create temporary table t4 (id int auto_increment primary key);
ERROR 1787 (HY000): Statement violates GTID consistency: CREATE TEMPORARY TABLE and DROP TEMPORARY TABLE can only be executed outside transactional context. These statements are also not allowed in a function or trigger because functions and triggers are also considered to be multi-statement transactions.
[root@mysql.sock][db1]> rollback;
Query OK, 0 rows affected (0.00 sec)
[root@mysql.sock][db1]> create temporary table t4 (id int auto_increment primary key);
Query OK, 0 rows affected (0.01 sec)
[root@mysql.sock][db1]> desc t4;
+-------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
+-------+---------+------+-----+---------+----------------+
1 row in set (0.00 sec)
[root@mysql.sock][db1]> drop temporary table t4;
Query OK, 0 rows affected (0.00 sec)
[root@mysql.sock][db1]> desc t4;
ERROR 1146 (42S02): Table 'db1.t4' doesn't exist
开启--enforce-gtid-consistency参数,阻止执行违反GTID-based复制原则的语句。
跳过事务的执行,参数sql_slave_skip_counter不再起作用,需要使用如下注入空事务的方式跳过。
SET GTID_NEXT='aaa-bbb-ccc-ddd:N';
BEGIN;
COMMIT;
SET GTID_NEXT='AUTOMATIC';
CHANGE MASTER TO语句中的IGNORE_SERVER_IDS不在起作用,已经回放过的事务会自动跳过。
在开启GTID的实例上使用mysqldump导出数据时,在备份文件中会设置@@SESSION.SQL_LOG_BIN= 0,当使用该备份文件向目标实例导入数据时,不记录二进制日志。
在开启GTID的实例上使用mysql_upgrade原地升级MySQL版本时,要不写二进制日志(这也是mysql_upgrade的默认行为,没开启--write-binlog)。
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