It  is very important to monitor the MySQL replication . The following command will shows the slave status in real time.

Just login to slave MySQL console and type the following command

mysql> show slave status \G
*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: 172.16.1.115
                Master_User: slave2
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: mysql-bin.000175
        Read_Master_Log_Pos: 4104599
             Relay_Log_File: mysqld-relay-bin.000004
              Relay_Log_Pos: 4104736
      Relay_Master_Log_File: mysql-bin.000175
           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: 4104599
            Relay_Log_Space: 4104736
            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
1 row in set (0.00 sec)

mysql>

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