今天在测试新的搜索技术时，检查数据库发现一台MySQL Slave未和主机同步，查看Slave状态：
mysql> show slave status\G
Slave_IO_Running: Yes
Slave_SQL_Running: No
Last_Errno: 1062
....
Seconds_Behind_Master:NULL
原因：
1.程序可能在slave上进行了写操作
2.也可能是slave机器重起后，事务回滚造成的.
解决办法I：
1.首先停掉Slave服务：slave stop
2.到主服务器上查看主机状态：
记录File和Position对应的值。
mysql> show master status;
+------------------+-----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+-----------+--------------+------------------+
| mysql-bin.000020 | 135617781 | | |
+------------------+-----------+--------------+------------------+
1 row in set (0.00 sec)
3.到slave服务器上执行手动同步：
mysql> change master to
> master_host='master_ip',
> master_user='user',
> master_password='pwd',
> master_port=3307,
> master_log_file='mysql-bin.000020',
> master_log_pos=135617781;
1 row in set (0.00 sec)
#我执行的sql
mysql> change master to master_host='192.168.10.14', master_user='repl', master_password='repl', master_port=3306, master_log_file='mysql-bin.000006', master_log_pos=98;
mysql> slave start;
1 row in set (0.00 sec)
再次查看slave状态发现：
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
...
Seconds_Behind_Master: 0
解决办法II：
mysql> slave stop;
mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;
mysql> slave start;
source:http://java221.iteye.com/blog/686284
