便於數據恢復，設置從庫延遲主庫1個小時
此圖借用李磊的 直接上圖了 非本人筆記
CHANGE MASTER TO MASTER_DELAY = 1800；單位爲秒
[root@backup ~]# mysql -uroot -p123456 -e "show slave status \G"|grep -i sql mysql: [Warning] Using a password on the command line interface can be insecure. Master_Log_File: mysql-bin.000008 Relay_Master_Log_File: mysql-bin.000008 Slave_SQL_Running: Yes Last_SQL_Errno: 0 Last_SQL_Error: Master_Info_File: /home/nflow/data/backup/mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Last_SQL_Error_Timestamp:
[root@backup ~]# mysql -uroot -p123456 -e "show slave status \G"|grep -i sql mysql: [Warning] Using a password on the command line interface can be insecure. Master_Log_File: mysql-bin.000008 Relay_Master_Log_File: mysql-bin.000008 Slave_SQL_Running: Yes Last_SQL_Errno: 0 Last_SQL_Error: Master_Info_File: /home/nflow/data/backup/mysql/data/master.info SQL_Delay: 1800 #代表延遲同步1800s SQL_Remaining_Delay: 1775 #從1800 每秒減一個 Slave_SQL_Running_State: Waiting until MASTER_DELAY seconds after master executed event Last_SQL_Error_Timestamp: [root@backup ~]#
SQL_Delay：正數表明slave有延遲了。
SQL_Remaining_Delay：整數表明延遲時間。
Slave_SQL_Running_State：表明sql線程狀態。