I've created an RDS Aurora Serverless cluster with a maximum ACU of 1 and have noticed a high number of Volume Write IOPS, despite not creating a database or ever connecting to the cluster:
I've looked through the general_log and noticed this statement, which is executed approximately every 2 seconds:
INSERT INTO mysql.rds_heartbeat2(id, value) values (1,1607638395773) ON DUPLICATE KEY UPDATE value = 1607638395773 ;
This would explain some of the Write IOPS but nothing close to the 550 per minute that the graph is showing.
Can someone explain where these IOPS are coming from?