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Slave_SQL_Running: No mysql同步故障解决方法

 

Slave_SQL_Running: No mysql同步故障解决

     今天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)

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;

 

自己的使用体会:方法一是强制性从某一个点开始同步,会有部分没有同步的数据丢失,后续主服务器上删除记录同步也会有一些错误信息,不会影响使用.方法二不一定会有效果.

 

 

=======================================================================================]

1,主从不能同步:

show slave status;报错:Error xxx dosn't exist

且show slave status/G:

Slave_SQL_Running: NO

Seconds_Behind_Master: NULL

解决方法:

stop slave;

set global sql_slave_skip_counter =1 ;

start slave;

之后Slave会和Master去同步 主要看:

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Seconds_Behind_Master是否为0,0就是已经同步了

2,还需要做的一些优化与监视:

show full processlist; //查看mysql当前同步线程号

skip-name-resolve       //跳过dns名称查询,有助于加快连接及同步的速度

max_connections=1000    //增大Mysql的连接数目,(默认100)

max_connect_errors=100 //增大Mysql的错误连接数目,(默认10)

 

 

查看日志一些命令

1,  show master status/G;

           在这里主要是看log-bin的文件是否相同。

    show slave status/G;

    在这里主要是看:

                   Slave_IO_Running=Yes

                   Slave_SQL_Running=Yes

   如果都是Yes,则说明配置成功.

2,在master上输入show processlist/G;

     mysql> SHOW PROCESSLIST/G

     *************************** 1. row ***************************

       Id: 2

       User: root

       Host: localhost:32931

       db: NULL

       Command: Binlog Dump

       Time: 94

       State: Has sent all binlog to slave; waiting for binlog to

         be updated

       Info: NULL

   如果出现Command: Binlog Dump,则说明配置成功.

 

 

stop slave    #停止同步 

start slave    #开始同步,从日志终止的位置开始更新。 

SET SQL_LOG_BIN=0|1  #主机端运行,需要super权限,用来开停日志,随意开停,会造成主机从机数据不一致,造成错误 

SET GLOBAL SQL_SLAVE_SKIP_COUNTER=n  # 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。 

RESET MASTER  #主机端运行,清除所有的日志,这条命令就是原来的FLUSH MASTER 

RESET SLAVE   #从机运行,清除日志同步位置标志,并重新生成master.info

虽然重新生成了master.info,但是并不起用,最好,将从机的mysql进程重启一下, 

LOAD TABLE tblname FROM MASTER #从机运行,从主机端重读指定的表的数据,每次只能读取一个,受timeout时间限制,需要调整timeout时间。执行这个命令需要同步账号有 reload和super权限。以及对相应的库有select权限。如果表比较大,要增加net_read_timeout 和 net_write_timeout的值 

LOAD DATA FROM MASTER  #从机执行,从主机端重新读入所有的数据。执行这个命令需要同步账号有reload和super权限。以及对相应的库有select权限。如果表比较大,要增加net_read_timeout 和 net_write_timeout的值 

CHANGE MASTER TO master_def_list  #在线改变一些主机设置,多个用逗号间隔,比如

CHANGE MASTER TO

  MASTER_HOST='master2.mycompany.com',

  MASTER_USER='replication',

  MASTER_PASSWORD='bigs3cret' 

MASTER_POS_WAIT() #从机运行 

SHOW MASTER STATUS #主机运行,看日志导出信息 

SHOW SLAVE HOSTS #主机运行,看连入的从机的情况。 

SHOW SLAVE STATUS (slave) 

SHOW MASTER LOGS (master) 

SHOW BINLOG EVENTS [ IN 'logname' ] [ FROM pos ] [ LIMIT [offset,] rows ] 

PURGE [MASTER] LOGS TO 'logname' ; PURGE [MASTER] LOGS BEFORE 'date'
 

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