故障原因:
开发人员在主库上修改了一张表的结构,加了一个字段,从库由于各种原因没有同步过去,导致主从同步失败。
故障处理:
1、查看在从库上查看同步状态:
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.10.100.100
Master_User: slave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000009
Read_Master_Log_Pos: 917648
Relay_Log_File: mysqld-relay-bin.000017
Relay_Log_Pos: 778406
Relay_Master_Log_File: mysql-bin.000009
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB: mysql,information_schema,performance_schema,test,mysql,information_schema,performance_schema,test
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1054
Last_Error: Error 'Unknown column 'js_code' in 'field list'' on query. Default database: 'web_platform'. Query: 'update act_id set js_code='确保该页面的PV埋点已经上报;__tj(node,snode,cid,w,'''','''','''');说明:remark;' where act_id=11'
Skip_Counter: 0
Exec_Master_Log_Pos: 906099
Relay_Log_Space: 790258
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: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 1054
Last_SQL_Error: Error 'Unknown column 'js_code' in 'field list'' on query. Default database: 'web_platform'. Query: 'update act_id set js_code='确保该页面的PV埋点已经上报;__tj(node,snode,cid,w,'''','''','''');说明:remark;' where act_id=11'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)
2、从上面可以看出表act_id的js_code字段在从库上没有,可以对比一下主库和从库这张表的结构:
查看主库:
mysql> desc act_id;
+-----------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+----------------+
| act_id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| name | varchar(512) | NO | | NULL | |
| fields | varchar(512) | NO | | NULL | |
| js_code | text | NO | | NULL | |
| remark | varchar(512) | NO | | NULL | |
| create_user | varchar(256) | NO | | NULL | |
| duty_user_name | varchar(256) | NO | | NULL | |
| duty_user_email | varchar(256) | YES | | NULL | |
| duty_user_phone | varchar(256) | YES | | NULL | |
| create_time | bigint(20) | NO | | NULL | |
| update_time | bigint(20) | NO | | NULL | |
+-----------------+------------------+------+-----+---------+----------------+
11 rows in set (0.00 sec)
查看从库:
mysql> desc act_id;
+-----------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+----------------+
| act_id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| name | varchar(512) | NO | | NULL | |
| fields | varchar(512) | NO | | NULL | |
| remark | varchar(512) | NO | | NULL | |
| create_user | varchar(256) | NO | | NULL | |
| duty_user_name | varchar(256) | NO | | NULL | |
| duty_user_email | varchar(256) | YES | | NULL | |
| duty_user_phone | varchar(256) | YES | | NULL | |
| create_time | bigint(20) | NO | | NULL | |
| update_time | bigint(20) | NO | | NULL | |
+-----------------+------------------+------+-----+---------+----------------+
10 rows in set (0.00 sec)
3、在正式处理故障之前要停掉主库和从库的slave进程(我的环境是做了双向同步,即主主同步)
mysql> slave stop;
Query OK, 0 rows affected (0.12 sec)
4、在从库上加缺少的字段:
alter table act_id add js_code text not Null AFTER fields;
5、启动从库的slave进程,查看主从状态:
mysql> slave start;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.10.100.100
Master_User: slave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000009
Read_Master_Log_Pos: 917648
Relay_Log_File: mysqld-relay-bin.000117
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000009
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB: mysql,information_schema,performance_schema,test,mysql,information_schema,performance_schema,test
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: 917648
Relay_Log_Space: 556
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
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)
6、查看从库的master信息,在主库上从新change
从库上:
mysql> show master status \G
*************************** 1. row ***************************
File: mysql-bin.000009
Position: 235
Binlog_Do_DB:
Binlog_Ignore_DB: mysql,information_schema,performance_schema,test,mysql,information_schema,performance_schema,test
1 row in set (0.00 sec)
主库上:
mysql> change master to master_host="10.10.100.101", master_port=3306, master_user='slave', master_password='123456', master_log_file='mysql-bin.000009', master_log_pos=235;
1 row in set (0.00 sec)
7、对比主库和从库这两张表的结构和数据是否一样:
主库:
mysql> show create table act_id;
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| act_id | CREATE TABLE `act_id` (
`act_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(512) NOT NULL,
`fields` varchar(512) NOT NULL,
`js_code` text NOT NULL,
`remark` varchar(512) NOT NULL,
`create_user` varchar(256) NOT NULL,
`duty_user_name` varchar(256) NOT NULL,
`duty_user_email` varchar(256) DEFAULT NULL,
`duty_user_phone` varchar(256) DEFAULT NULL,
`create_time` bigint(20) NOT NULL,
`update_time` bigint(20) NOT NULL,
PRIMARY KEY (`act_id`),
UNIQUE KEY `act_id_UNIQUE` (`act_id`)
) ENGINE=MyISAM AUTO_INCREMENT=100 DEFAULT CHARSET=utf8 |
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> desc act_id;
+-----------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+----------------+
| act_id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| name | varchar(512) | NO | | NULL | |
| fields | varchar(512) | NO | | NULL | |
| js_code | text | NO | | NULL | |
| remark | varchar(512) | NO | | NULL | |
| create_user | varchar(256) | NO | | NULL | |
| duty_user_name | varchar(256) | NO | | NULL | |
| duty_user_email | varchar(256) | YES | | NULL | |
| duty_user_phone | varchar(256) | YES | | NULL | |
| create_time | bigint(20) | NO | | NULL | |
| update_time | bigint(20) | NO | | NULL | |
+-----------------+------------------+------+-----+---------+----------------+
11 rows in set (0.00 sec)
从库:
mysql> show create table act_id;
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| act_id | CREATE TABLE `act_id` (
`act_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(512) NOT NULL,
`fields` varchar(512) NOT NULL,
`js_code` text NOT NULL,
`remark` varchar(512) NOT NULL,
`create_user` varchar(256) NOT NULL,
`duty_user_name` varchar(256) NOT NULL,
`duty_user_email` varchar(256) DEFAULT NULL,
`duty_user_phone` varchar(256) DEFAULT NULL,
`create_time` bigint(20) NOT NULL,
`update_time` bigint(20) NOT NULL,
PRIMARY KEY (`act_id`),
UNIQUE KEY `act_id_UNIQUE` (`act_id`)
) ENGINE=MyISAM AUTO_INCREMENT=100 DEFAULT CHARSET=utf8 |
+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> desc act_id;
+-----------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+----------------+
| act_id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| name | varchar(512) | NO | | NULL | |
| fields | varchar(512) | NO | | NULL | |
| js_code | text | NO | | NULL | |
| remark | varchar(512) | NO | | NULL | |
| create_user | varchar(256) | NO | | NULL | |
| duty_user_name | varchar(256) | NO | | NULL | |
| duty_user_email | varchar(256) | YES | | NULL | |
| duty_user_phone | varchar(256) | YES | | NULL | |
| create_time | bigint(20) | NO | | NULL | |
| update_time | bigint(20) | NO | | NULL | |
+-----------------+------------------+------+-----+---------+----------------+
11 rows in set (0.00 sec)
处理完成。
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故障案例主从不同步数据库
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