故障现象： 进入slave服务器，运行： mysql show slave status\g ....... relay_log_file: localhost-relay-bin.000535 relay_log_pos: 21795072 relay_master_log_file: localhost-bin.000094 slave_io_running: yes slave_sql_running: no replicate_do_db
故障现象：
进入slave服务器，运行：
mysql> show slave status\g
         .......
             relay_log_file: localhost-relay-bin.000535
              relay_log_pos: 21795072
      relay_master_log_file: localhost-bin.000094
          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：
mysql> slave stop;
mysql> set global sql_slave_skip_counter=1;
mysql> slave start;
解决办法二、
首先停掉slave服务：slave stop
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.000094 | 33622483 |              |                  | 
+----------------------+----------+--------------+------------------+
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='pwd', 
> master_port=3306, 
> master_log_file=localhost-bin.000094', 
> master_log_pos=33622483 ;
1 row in set (0.00 sec)
mysql> slave start;
1 row in set (0.00 sec)
mysql> show slave status\g
*************************** 1. row ***************************
........
            master_log_file: localhost-bin.000094
        read_master_log_pos: 33768775
             relay_log_file: localhost-relay-bin.000537
              relay_log_pos: 1094034
      relay_master_log_file: localhost-bin.000094
           slave_io_running: yes
          slave_sql_running: yes
            replicate_do_db:
手动同步需要停止master的写操作！