mysql主從複製-故障案例一

一、從庫上看到以下錯誤

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                從庫SQL線程已經中止
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 1007              報錯（錯誤代碼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)

二、查看錯誤代碼，肯定錯誤類型

    

三、根據錯誤提示和錯誤代碼，咱們能夠肯定，從庫已經有"shaw",這個庫，致使同步主庫上的"shaw"庫時，發生衝突

四、解決方法（從庫上操做）

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)

五、再次查看狀態（從庫）

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)

六、測試主從同步是否正常

mysql> show databases;    主庫數據
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gamedb             |
| mysql              |
| performance_schema |
| shaw               |
| test               |
+--------------------+

mysql> show databases;    從庫數據
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gamedb             |
| mysql              |
| performance_schema |
| shaw               |
| test               |
+--------------------+

mysql> drop database shaw;        主庫上刪除數據
Query OK, 0 rows affected (0.01 sec)

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

mysql> show databases;        從庫已經同步主庫數據
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gamedb             |
| mysql              |
| performance_schema |
| test               |
+--------------------+