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When should I choose Provisioned IOPS over Standard RDS storage?

A.
If you have batch-oriented workloads

B.
If you use production online transaction processing (OLTP) workloads.

C.
If you have workloads that are not sensitive to consistent performance

Explanation:
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Storage.html
Amazon RDS provisions that IOPS rate and storage for the lifetime of the DB instance or until you change it.
Provisioned IOPS storage is optimized for I/O intensive, online transaction processing (OLTP) workloads that
have consistent performance requirements. Provisioned IOPS helps performance tuning.

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