mysql主从复制-故障案例一

1、从库上看到如下错误

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.18.10.11
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000021
          Read_Master_Log_Pos: 273
               Relay_Log_File: mysql-relay-bin.000051
                Relay_Log_Pos: 336
        Relay_Master_Log_File: mysql-bin.000021
             Slave_IO_Running: Yes
            Slave_SQL_Running: No                从库SQL线程已经停止
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 1007              报错（错误代码1007）
                   Last_Error: Error ‘Can‘t create database ‘shaw‘; database exists‘ on query. Default database: ‘shaw‘. Query: ‘create database shaw‘
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 190
              Relay_Log_Space: 721
              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: 1007
               Last_SQL_Error: Error ‘Can‘t create database ‘shaw‘; database exists‘ on query. Default database: ‘shaw‘. Query: ‘create database shaw‘
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
1 row in set (0.00 sec)

2、查看错误代码，确定错误类型

3、根据错误提示和错误代码，我们可以确定，从库已经有"shaw",这个库，导致同步主库上的"shaw"库时，发生冲突

4、解决方法（从库上操作）

mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)

mysql> set global sql_slave_skip_counter=1;
Query OK, 0 rows affected (0.00 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

5、再次查看状态（从库）

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.18.10.11
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000021
          Read_Master_Log_Pos: 273
               Relay_Log_File: mysql-relay-bin.000052
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000021
             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: 
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 273
              Relay_Log_Space: 721
              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、测试主从同步是否正常

mysql> show databases;    主库数据
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gamedb             |
| mysql              |
| performance_schema |
| shaw               |
| test               |
+--------------------+

mysql> show databases;    从库数据
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gamedb             |
| mysql              |
| performance_schema |
| shaw               |
| test               |
+--------------------+

mysql> drop database shaw;        主库上删除数据
Query OK, 0 rows affected (0.01 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gamedb             |
| mysql              |
| performance_schema |
| test               |
+--------------------+

mysql> show databases;        从库已经同步主库数据
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gamedb             |
| mysql              |
| performance_schema |
| test               |
+--------------------+

mysql主从复制-故障案例一

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