What should a database specialist do to avoid unnecessary charges for the unused cluster volume space?
Take a snapshot of the cluster volume. Restore the snapshot in another cluster with a smaller volume size.
Use the AWS CLI to turn on automatic resizing of the cluster volume.
Export the cluster data into a new Neptune DB cluster.
Add a Neptune read replica to the cluster. Promote this replica as a new primary DB instance. Reset the storage space of the cluster.
Explanations:
Taking a snapshot and restoring it to a new cluster with a smaller volume size doesn’t automatically reclaim space.
The AWS CLI can manage automatic resizing, but it does not reduce storage space once it’s been allocated.
Exporting the data into a new Neptune DB cluster can help to reclaim unused space after deletion of data.
Adding a read replica and promoting it does not reset or reduce the storage space used in the cluster.