Performance and Scaling in Amazon Neptune
Neptune DB clusters and instances scale at three different levels:
Storage Scaling in Neptune
Neptune storage automatically scales with the data in your cluster volume. As your data grows, your cluster volume storage grows, up to 128 TiB in all supported regions except China and GovCloud, where it is limited to 64 TiB.
The size of your cluster volume is checked on an hourly basis to determine your storage costs.
Storage consumed by your Neptune database is billed in per GB-month increments and I/Os consumed are billed in per million request increments. You pay only for the storage and I/Os that your Neptune database consumes, and you don't need to provision in advance.
For pricing information, see the Neptune
product page
Instance Scaling in Neptune
You can scale your Neptune DB cluster as needed by modifying the DB instance class for each DB instance in the DB cluster. Neptune supports several optimized DB instance classes.
Read Scaling in Neptune
You can achieve read scaling for your Neptune DB cluster by creating up to 15 Neptune replicas in the DB cluster. Each Neptune replica returns the same data from the cluster volume with minimal replica lag (often considerably less than 100 milliseconds after the primary instance has written an update). As your read traffic increases, you can create additional Neptune replicas and connect to them directly to distribute the read load for your DB cluster. Neptune replicas don't have to be of the same DB instance class as the primary instance.
For information about adding Neptune replicas to a DB cluster, see Adding reader instances.
