How does RDS optimize storage work?
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What happens in the backend when a customer submits a request to their Oracle RDS to increase the IOPS for the storage? Is this process the same when changing the storage size and if not, how is changing the storage size different from increasing the IOPS?
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RDS uses EBS Elastic Volumes.https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-modify-volume.html
So whether changing IOPS or storage size or type it is handled seamlessly by the EBS EVs. The only exception would be if your database was created before EVs. Then the first time you make that storage change you will have some degraded performance while the old volumes are copied to the new EV ones. But from then on there should be no impact if you make any other changes again.
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