准备工作 | Create table test_autoinc(id int auto_increment, c1 int,c2 varchar(100),primary key(id),unique key(c1)); insert into test_autoinc(c1,c2) values(1,'abc'); insert into test_autoinc(c1,c2) values(2,'abc'); insert into test_autoinc(c1,c2) values(3,'abcdd'); insert into test_autoinc(c1,c2) values(4,'abcdd'); insert into test_autoinc(c1,c2) values(5,'abcdd'); |
1 | 操作 | 备注 | Master | slave |
2 | 查看自增列值 Show create table test_autoinc\G | 插入5条记录后，自增列值变为6 | CREATE TABLE `test_autoinc` ( `id` int(11) NOT NULL AUTO_INCREMENT, `c1` int(11) DEFAULT NULL, `c2` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `c1` (`c1`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8; | CREATE TABLE `test_autoinc` ( `id` int(11) NOT NULL AUTO_INCREMENT, `c1` int(11) DEFAULT NULL, `c2` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `c1` (`c1`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 |
3 | 查看表数据 |
| id | c1 | c2 ---+------+------ 1 | 1 | abc 2 | 2 | abc 3 | 3 | abcdd 4 | 4 | abcdd 5 | 5 | abcdd | id | c1 | c2 ---+------+------ 1 | 1 | abc 2 | 2 | abc 3 | 3 | abcdd 4 | 4 | abcdd 5 | 5 | abcdd |
4 | 查看binlog位置 show master status\G | 记录当前binlog位点， 后续可以查看replace动作产生的binlog事件 | mysql-bin.000038 59242888 |
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5 | replace操作 replace into test_autoinc(c1,c2) values(2,'eeee'); | 影响两条记录，主库replace= delete+insert | Query OK, 2 rows affected (0.00 sec) |
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6 | 查看表数据 |
| id | c1 | c2 ---+------+------- 1 | 1 | abc 3 | 3 | abcdd 4 | 4 | abcdd 5 | 5 | abcdd 6 | 2 | eeee | id | c1 | c2 ---+------+------- 1 | 1 | abc 3 | 3 | abcdd 4 | 4 | abcdd 5 | 5 | abcdd 6 | 2 | eeee |
7 | 查看binlog事件 show binlog events in 'mysql-bin.000038' from 59242888; | 也可以通过mysqlbinlog工具分析日志，查询从库执行的update语句 | Pos | Event_type ---------+--------------- 59242888 | Query 59242957 | Table_map 59243013 |Update_rows_v1 59243072 | Xid |
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8 | 查看自增列值 Show create table test_autoinc\G; | 此时master的自增列为7，而slave的自增列为6，与表内最大值相同 | CREATE TABLE `test_autoinc` ( `id` int(11) NOT NULL AUTO_INCREMENT, `c1` int(11) DEFAULT NULL, `c2` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `c1` (`c1`) ) ENGINE=InnoDBAUTO_INCREMENT=7 | CREATE TABLE `test_autoinc` ( `id` int(11) NOT NULL AUTO_INCREMENT, `c1` int(11) DEFAULT NULL, `c2` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `c1` (`c1`) ) ENGINE=InnoDBAUTO_INCREMENT=6 |
| 9 | 手工调大自增主键 Show create table test_autoinc\G; | 手工调大自增id alter table test_autoinc auto_increment=12; | Show create table test_autoinc\G; | alter table test_autoinc auto_increment=12; Show create table test_autoinc\G; 发现master和slave的自增id一致 |
