Replication

Slave

Status

To check the status of a slave, log into the slave server, run mysql, then:

mysql> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: 192.167.100.54
                Master_User: myslaveuser
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: bin-log.000721
        Read_Master_Log_Pos: 31533
             Relay_Log_File: relay-bin.001541
              Relay_Log_Pos: 31668
      Relay_Master_Log_File: bin-log.000721
           Slave_IO_Running: Yes
          Slave_SQL_Running: Yes
            Replicate_Do_DB: myfirstdb,myseconddb
        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: 31533
            Relay_Log_Space: 31668
            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)

Check:

• Seconds_Behind_Master is close to 0…

• Slave_IO_Running and Slave_SQL_Running are both Yes.

• If there has been an error, then Last_Errno and Last_Error will show the problem.

Stop

To stop a slave, log into the slave server, run mysql, then:

mysql> STOP SLAVE;