MySQL5.7和8.0支持通过replication_applier_status表获同步延迟时间，当从库出现延迟后，该表中的字段REMAINING_DELAY记录延迟秒数，当没有延迟时，该字段值为NULL，官方对该字段介绍如下：REMAINING_DELAY IfthereplicaiswaitingforDESIRED_DELAYsecondstopasssincethesourceappliedanevent,thisfieldcontainsthenumberofdelaysecondsremaining.Atothertimes,thisfieldisNULL.(TheDESIRE

MySQL5.7和8.0支持通过replication_applier_status表获同步延迟时间，当从库出现延迟后，该表中的字段REMAINING_DELAY记录延迟秒数，当没有延迟时，该字段值为NULL，官方对该字段介绍如下：REMAINING_DELAY IfthereplicaiswaitingforDESIRED_DELAYsecondstopasssincethesourceappliedanevent,thisfieldcontainsthenumberofdelaysecondsremaining.Atothertimes,thisfieldisNULL.(TheDESIRE