mysql主从不同步、数据不一致解决办法

向右看齐 2022-09-25 01:23 229阅读 0赞

**第一种:通过sql\_slave\_skip\_counter跳过同步错误，适用于一般异常如插入时主键冲突**

这种情况一般是在从库进行了写操作，错误提示

Last\_SQL\_Errno: 1062

Last\_SQL\_Error: Error 'Duplicate entry '14' for key 'PRIMARY'' on query. Default database: 'hadoop'. Query: 'INSERT INTO \`user\` (\`username\`, \`password\`) VALUES ('b', 'b')'  
1 row in set (0.00 sec)

如果提示

Last\_SQL\_Errno: 126  
Last\_SQL\_Error: Error 'Incorrect key file for table './hadoop/user.MYI'; try to repair it' on query. Default database: 'hadoop'. Query: 'INSERT INTO \`user\` (\`username\`, \`password\`) VALUES ('c', 'c')'

则先修复下表repair table user;再继续下面的操作

从库执行:

#停止slave服务
    mysql> stop slave;
    Query OK, 0 rows affected, 1 warning (0.00 sec)
    #跳过一步错误，后面的数字可变，如果还不行可执行多次
    mysql> set global sql_slave_skip_counter =1;
    Query OK, 0 rows affected (0.00 sec)
    #开始slave服务
    mysql> start slave;
    Query OK, 0 rows affected (0.00 sec)
    #查看slave状态
    mysql> show slave status\G
    *************************** 1. row ***************************
                   Slave_IO_State: Waiting for master to send event
                      Master_Host: 192.168.20.195
                      Master_User: test
                      Master_Port: 3306
                    Connect_Retry: 60
                  Master_Log_File: mysql-bin.000004
              Read_Master_Log_Pos: 251
                   Relay_Log_File: mysqld-relay-bin.000006
                    Relay_Log_Pos: 251
            Relay_Master_Log_File: mysql-bin.000004
                 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: mysql.%,information_schema.%,performance_schema.%
                       Last_Errno: 0
                       Last_Error:
                     Skip_Counter: 1
              Exec_Master_Log_Pos: 251
                  Relay_Log_Space: 552
                  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:
    1 row in set (0.00 sec)

**第二种:重新做主从，然后使用change master指定同步位置，这种耗时长**  
主库执行：

mysql> flush tables with read lock; 
    [root@hd3 ~]# mysqldump -uroot -p123456 --lock-all-tables --flush-logs hadoop > /data/hadoop.sql
    [root@hd3 ~]# scp /data/hadoop.sql root@192.168.20.201:/data/
    mysql> unlock tables;

从库执行:

mysql> stop slave;
    Query OK, 0 rows affected (0.00 sec)
    mysql> reset slave;
    Query OK, 0 rows affected (0.01 sec)
    mysql> source /data/hadoop.sql
    mysql> change master to master_host='192.168.20.195', master_port=3306, master_user='test',master_password='123456', master_log_file='mysql-bin.000003',master_log_pos=932;
    Query OK, 0 rows affected (0.03 sec)
    mysql> start slave;
    Query OK, 0 rows affected (0.00 sec)

第三种：使用第三方工具如pt-table-sync