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This can scale up much more than a single RDS database since it spreads the data across multiple machines, but it's not exactly a replacement for MySQL database. It's also possible that this doesn't make use of EBS, which could make it perform more predictably and protect it from failure when EBS fails.

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> It's also possible that this doesn't make use of EBS

This quote from the product page seems to indicate that EBS is not used for primary data storage: "it runs on hardware that is optimized for data warehousing, with local attached storage and 10GigE network connections between nodes."

Why isn't it a replacement? From what I read it seems it's like a very large and transparantly scalable SQL database

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