mysql主从同步怎么跳过错误

今天介绍两种mysql主从同步跳过错误的方法：

一、两种方法介绍

1、跳过指定数量的事务：

mysql>slave stop;
mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1        #跳过一个事务
mysql>slave start

2、修改mysql的配置文件，通过slave_skip_errors参数来跳所有错误或指定类型的错误

vi /etc/my.cnf

[mysqld]
#slave-skip-errors=1062,1053,1146  #跳过指定error no类型的错误
#slave-skip-errors=all  #跳过所有错误

二、试验环节

下面模拟一个错误场景
1、环境（一个已经配置好的主从复制环境）
master数据库IP：192.168.0.201
slave数据库IP：192.168.0.202
mysql版本：8.0.23
binlog-do-db = mydb

2、在master上执行以下语句：

mysql>use mysql;
mysql>create table t1 (id int);
mysql>use mydb;
mysql>insert into mysql.t1 select 1;

在slave上查看复制状态

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.200
                  Master_User: slave1
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-bin.000084
          Read_Master_Log_Pos: 19843
               Relay_Log_File: slave-relay-bin.000004
                Relay_Log_Pos: 1982
        Relay_Master_Log_File: master-bin.000084
             Slave_IO_Running: Yes
            Slave_SQL_Running: No
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 1146
                   Last_Error: Error 'Table 'mysql.t1' doesn't exist' on query. Default database: 'mydb'. Query: 'insert into mysql.t1 select 1'
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 2319
              Relay_Log_Space: 2145
              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: 1146
               Last_SQL_Error: Error 'Table 'mysql.t1' doesn't exist' on query. Default database: 'mydb'. Query: 'insert into mysql.t1 select 1'
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 2013306
                  Master_UUID: ed5a23af-1650-11ee-84bd-0242ac110002
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: 
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 231210 21:37:19
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
1 row in set (0.00 sec)

由结果可以看到，Read_Master_Log_Pos: 19843，Exec_Master_Log_Pos: 2319时出错了Last_SQL_Error: Error ‘Table ‘mysql.t1’ doesn’t exist’ on query.

因为只对mydb记录了binlog,当在mydb库操作其它数据库的表，但该表在slave上又不存在时就出错了。

如果在配置文件中忽略了该错误，则主从集群不会因为上述问题而停止工作。