在做MySQL主从同步的时候通过：

mysql> show slave status\G;
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 192.168.18.139Master_User: repMaster_Port: 3307Connect_Retry: 60Master_Log_File: mysql-bin.000001Read_Master_Log_Pos: 107Relay_Log_File: relay-bin.000002Relay_Log_Pos: 253Relay_Master_Log_File: mysql-bin.000001Slave_IO_Running: YesSlave_SQL_Running: YesSeconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: NoMaster_Server_Id: 3
1 row in set (0.00 sec)ERROR:
No query specified    ==>出现此错误

出现此错误的原因是因为执行命令：show slave status\G;的时候，多加了一个“;”分号。

当执行命令的时候去掉分号，就不会出现此错误。

ysql> show slave status\G
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 192.168.18.139Master_User: repMaster_Port: 3307Connect_Retry: 60Master_Log_File: mysql-bin.000001Read_Master_Log_Pos: 107Relay_Log_File: relay-bin.000002Relay_Log_Pos: 253Relay_Master_Log_File: mysql-bin.000001Slave_IO_Running: YesSlave_SQL_Running: YesSeconds_Behind_Master: 0
1 row in set (0.00 sec)mysql>