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Comment by everettForth | Hacker News Reader

The 75% reduction in indexed storage cost is a big win, from my perspective.

At $0.25 / GB / month it's now roughly 2.5x the cost of EBS disk-based storage, and you're only charged for data as you use it, with no need to reserve it ahead of time.

The alternative of running postgres or mongodb on an ebs-backed ec2 instance just got a lot less attractive to me.

Way to go, Amazon!

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Well, you get the 85% price reduction for throughput only if you reserve read/write capacity for three years.

It's really a trivial cost compared to the DynamoDB price before. It used to cost about $3600/month to get 5000 writes/sec. Now in a bit more than 2 months you'll have broken even on the reserved price compared to the old DynamoDB price, and in a bit more than 3 months compared to the new DynamoDB price, for the 1 year investment. Any company using Dynamo for anything serious will probably rush to get the reserved capacity, since they've probably been spending a multiple of the reserved cost per month anyway.

But 70% for 1 year is an amazing price break when you think about it.

Run your project for a month, analyse the usage, and reserve that same capacity for a whole year, for the price of only 3 more months usage!

If your project has fairly consistent (or growing) usage, and is going to run for more than 3 months, it really doesn't need much more thought.

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