A paper by Md. Borhan Uddin, Bo He, and Radu Sion:
Experiments were performed to benchmark the Amazon Relational Database Service (RDS) within a TPC-C benchmarking framework. The TPC-C benchmark is one of the most widely adopted database performance benchmarking frameworks comparing OLTP performance of online transaction processing systems. Two types of Amazon RDS services were tested, namely the standard RDS (single availability zone) and the Multi- AZ RDS (synchronous ‘standby’ replica in multiple availability zones). For each service type, five different RDS instances were tested: Small, Large, Extra Large (XLarge), Double Extra Large (2XLarge), and Quadruple Extra Large (4XLarge).
Results are interesting to say the least:
Overall, we observed that at a very low load, the resulting throughput was also relatively low; at medium load, the throughput increased to a peak; at very high loads, the throughput decreased again.