show slave status\G; 命令輸出詳解
mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.10.118.25 Master_User: mysync Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000023 Read_Master_Log_Pos: 39913 Relay_Log_File: mysql-relay-bin.000031 Relay_Log_Pos: 40059 Relay_Master_Log_File: mysql-bin.000023 Slave_IO_Running: Yes #Yes表示io_thread的和主庫連接正常並能實施復制工作，No則說明與主庫通訊異常，多數情況是由主從間網絡引起的問題； Slave_SQL_Running: Yes #具體就是語句是否執行通過，常會遇到主鍵重復或是某個表不存在。 Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: mysql.%,test.%,information_schema.% Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 39913 Relay_Log_Space: 40361 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 #判斷主動同步延時的參考值，是通過比較sql_thread執行的event的timestamp和io_thread復制好的event的timestamp(簡寫為ts)進行比較，而得到的這么一個差值； 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: 18
1 row in set (0.00 sec) ERROR: No query specified mysql>
