故障现象：
进入slave服务器，运行：
mysql> show slave status\G
.......
Relay_Log_File: localhost-relay-bin.000001
Relay_Log_Pos: 151
Relay_Master_Log_File: localhost-bin.000002
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
......
解决办法一、
Slave_SQL_Running: No
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.
一般是事务回滚造成的：
解决办法一：
mysql> stop slave ;
mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1; #客户端运行，用来跳过几个事件，只有当同步进程出现错误而停止的时候才可以执行。
mysql> start slave ;
解决办法二：
首先停掉Slave服务：stop slave ;
到主服务器上查看主机状态：
记录File和Position对应的值
进入master
mysql> show master status;
+----------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+----------------------+----------+--------------+------------------+
| localhost-bin.000001 | 151 | | |
+----------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
然后到slave服务器上执行手动同步：
mysql> change master to
> master_host='master_ip',
> master_user='user',
> master_password='password',
> master_port=3306,
> master_log_file='localhost-bin.000001',
> master_log_pos=151,master_auto_position=0;
1 row in set (0.00 sec)
mysql> start slave ;
1 row in set (0.00 sec)
此时再查看从机：
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.103
Master_User: cfwxa
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000001
Read_Master_Log_Pos: 151
Relay_Log_File: localhost-relay-bin.000002
Relay_Log_Pos: 363
Relay_Master_Log_File: master-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 151
Relay_Log_Space: 571
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0 #表示已同步
手动同步需要停止master的写操作！
