I'm managing an Amazon Aurora account. Somebody set it up months ago. The service has TWO instances (same AZ): - project - project-eu-central-1b
Same class (db.t2.small), but different "Replication Role". First is Reader and the second is Writer. The service has only one cluster:project-cluster-1
I wouldn't like paying twice if I need only one instance but I'm not sure if Aurora actually needs two instances (W and R) to work or it was a bad initial setup.
Can I use one instance for reading/writing and "move permissions" on MySQL-side? I'm also interested in "Reserved instances". In actual scenario I think I need to buy two reserved instances, right?