MySQL Binlog--MIXED模式下数据更新

在 Mixed 模式下,MySQL 会根据执行的每一条具体的 SQL 语句来区分对待记录的日志形式,也就是在 statement 和 row 之间选择一种。
如果SQL语句为UPDATE/DELETE等修改语句时,并不是所有操作都以ROW模式记录变更操作。

测试Demo:

## 创建测试表
CREATE TABLE TB001(ID INT AUTO_INCREMENT PRIMARY KEY,C1 INT,C2 INT);

## 插入测试数据
INSERT INTO TB001(C1,C2)VALUES(1,1);

## 更新数据
UPDATE TB001 SET C2=2 WHERE C1=1;

查看生成的BINLOG事件:

SHOW BINLOG EVENTS IN 'mysql-bin.000002' FROM 9150 LIMIT 100;
+------------------+-------+------------+-----------+-------------+--------------------------------------------------------------------+
| Log_name         | Pos   | Event_type | Server_id | End_log_pos | Info                                                               |
+------------------+-------+------------+-----------+-------------+--------------------------------------------------------------------+
| mysql-bin.000002 |  9520 | Gtid       |   6322494 |        9585 | SET @@SESSION.GTID_NEXT= '4f268bbc-f79e-11e8-8d9d-b8ca3af84795:39' |
| mysql-bin.000002 |  9585 | Query      |   6322494 |        9666 | BEGIN                                                              |
| mysql-bin.000002 |  9666 | Intvar     |   6322494 |        9698 | INSERT_ID=1                                                        |
| mysql-bin.000002 |  9698 | Query      |   6322494 |        9809 | use `db001`; INSERT INTO TB001(C1,C2)VALUES(1,1)                   |
| mysql-bin.000002 |  9809 | Xid        |   6322494 |        9840 | COMMIT /* xid=1903 */                                              |
| mysql-bin.000002 |  9840 | Gtid       |   6322494 |        9905 | SET @@SESSION.GTID_NEXT= '4f268bbc-f79e-11e8-8d9d-b8ca3af84795:40' |
| mysql-bin.000002 |  9905 | Query      |   6322494 |        9986 | BEGIN                                                              |
| mysql-bin.000002 |  9986 | Query      |   6322494 |       10094 | use `db001`; UPDATE TB001 SET C2=2 WHERE C1=1                      |
| mysql-bin.000002 | 10094 | Xid        |   6322494 |       10125 | COMMIT /* xid=1904 */                                              |
+------------------+-------+------------+-----------+-------------+--------------------------------------------------------------------+

可以发现UPDATE操作被以STATEMENT格式进行记录。

====================================================

运维建议:

建议配置线上生产环境binlog_format=ROW,保证主从数据一致。

posted @ 2019-03-26 11:30  TeyGao  阅读(337)  评论(0编辑  收藏  举报