CHANGE MASTER TO MASTER_HOST=""

Question

CHANGE MASTER TO MASTER_HOST=""在5.0里面可以清空slave的信息，在5.1中不行了，被当bug改了，谁知道怎么样可以清空？

Answer 1

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.77
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 224272132
               Relay_Log_File: mysqld-relay-bin.000111
                Relay_Log_Pos: 1946071
        Relay_Master_Log_File: mysql-bin.000003
             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: 224272132
              Relay_Log_Space: 4247909
              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)ERROR: 
No query specifiedmysql> slave stop;
Query OK, 0 rows affected (0.00 sec)mysql> change master to master_host=''
    -> ;
Query OK, 0 rows affected (0.01 sec)mysql> slave start;
ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO
mysql> select version();
+------------+
| version()  |
+------------+
| 5.1.45-log |
+------------+
1 row in set (0.00 sec)没问题呢.