DynamoDB

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KVS or NoSQL database. It stores JSON with a unique key. Developed by Amazon, it is fast and cheap. However, there seem to be some drawbacks in terms of flexibility, such as invalidating later added indexes.

Also, the pricing system is a mystery. According to the estimate, it seems to be cheap.

Here's a summary of "What is AWS" in three lines.

NoSQL data storage

KVS

What is this? tkgshn.icon*3

AWS's Aurora seems to be compatible.