REMAINING_DELAY If the replica is waiting for DESIRED_DELAY seconds to pass since the source applied an event, this field contains the number of delay seconds remaining. At other times, this field is NULL. (The DESIRED_DELAY value is stored in the replication_applier_configuration table.)官方介绍:https://dev.mysql.com/doc/mysql-perfschema-excerpt/5.7/en/performance-schema-replication-applier-status-table.html
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