how-does-mysql-replication-really-work/ what-causes-replication-lag

 https://www.cnblogs.com/kevingrace/p/6274073.html

https://www.cnblogs.com/kevingrace/p/6261091.html

https://dba.stackexchange.com/questions/22623/mysql-exec-master-log-pos-value-greater-than-read-master-log-pos

https://dba.stackexchange.com/questions/18433/trying-to-understand-show-slave-status-g

https://dev.mysql.com/doc/refman/5.7/en/show-slave-status.html

https://www.percona.com/blog/2013/01/09/how-does-mysql-replication-really-work/

https://dev.mysql.com/doc/refman/5.7/en/replication-options-slave.html#sysvar_slave_compressed_protocol

https://www.percona.com/blog/2013/07/15/crash-resistant-replication-how-to-avoid-mysql-replication-errors/

https://www.percona.com/blog/2015/03/09/5-free-handy-tools-for-monitoring-and-managing-mysql-replication/

https://dev.mysql.com/doc/refman/8.0/en/replication-gtids-lifecycle.html

https://www.percona.com/blog/2013/01/09/how-does-mysql-replication-really-work/

https://blogs.oracle.com/jsmyth/what-causes-replication-lag

https://www.percona.com/blog/2014/05/02/how-to-identify-and-cure-mysql-replication-slave-lag/

Reasons for MySQL Replication Lag

Managing Slave Lag with MySQL Replication