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Please refere to our document for more detail: https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_WorkingWithReservedDBInstances.html
Note
Reserved Amazon Aurora instances always have the deployment option set to Single-AZ DB instance. However, when you create an Aurora DB cluster, the default deployment option is Create an Aurora Replica or Reader in a different AZ (Multi-AZ).
You must purchase a reserved DB instance for each DB instance you plan to use, including Aurora Replicas. Therefore, for Multi-AZ deployments on Aurora, you must purchase extra reserved DB instances.
Example:
Aurora cluster consists below instances:
- db.r6g.2xlarge: Writer
- db.r6g.2xlarge * 3: Reader
In this case, you should purchase db.r6g.2xlarge
RI 4 instances
.
If you need billing specific support, please open a support case to customer support to confirm see if you can choose right purchase option.
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