在从库进行锁表操作flush table with read lock，
通过show slave status\G 获取对应主库的位置点：
show slave status\G
*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 100.119.16.72 Master_User: root Master_Port: 20160 Connect_Retry: 60 Master_Log_File: mysql-bin.000005 Read_Master_Log_Pos: 274264328 Relay_Log_File: relay-bin.000070 Relay_Log_Pos: 14356867Relay_Master_Log_File: mysql-bin.000005 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: 0Exec_Master_Log_Pos: 274264328 Relay_Log_Space: 24804608 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: 0Master_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: 113235 Master_UUID: b6c2a4cb-8973-11e7-8042-6c92bf482dbf Master_Info_File: /data1/mysql_root/data/20160/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 6c1f2f1d-8875-11e7-b55d-18ded7a37fee:4103537-4109582,b6c2a4cb-8973-11e7-8042-6c92bf482dbf:1-13481914 Executed_Gtid_Set: 6c1f2f1d-8875-11e7-b55d-18ded7a37fee:4103537-4109582,b6c2a4cb-8973-11e7-8042-6c92bf482dbf:1-13481914,bf3d5f44-8973-11e7-aaa2-6c92bf482c5f:1-135 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec)
在从库执行show master status获取从库备份时的位置点：
show master status;
+------------------+----------+--------------+------------------+---------------------------------------------------------------------------------------------------------------------------------------------------+| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |+------------------+----------+--------------+------------------+---------------------------------------------------------------------------------------------------------------------------------------------------+| mysql-bin.000061 | 14461503 | | | 6c1f2f1d-8875-11e7-b55d-18ded7a37fee:4103537-4109582,b6c2a4cb-8973-11e7-8042-6c92bf482dbf:1-13482456,bf3d5f44-8973-11e7-aaa2-6c92bf482c5f:1-135 |+------------------+----------+--------------+------------------+---------------------------------------------------------------------------------------------------------------------------------------------------+1 row in set (0.00 sec)