If it's really a problem, you can always use the pt-heartbeat tool from the percona toolkit: https://docs.percona.com/percona-toolkit/pt-heartbeat.html https://

If it's really a problem, you can always use the pt-heartbeat tool from the percona toolkit: https://docs.percona.com/percona-toolkit/pt-heartbeat.html https://docs.percona.com/percona-toolkit/pt-heartbeat.html Conceptually it is very straightforward: It just updates the only row in a special table to the current time every --interval seconds on the main database, then monitors the value in any followers to see which value they have. Subtract the two timestamps to get replication lag.