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Re:There are very few suitable use cases for DynamoDB on Monday July 10, 2017 @07:52PM (#14740590)
Full disclosure: I am a member of DynamoDB team at AWS, but my opinions here are mine only

On the topic of DynamoDB use cases, here are some of DynamoDB users describing their use cases:

- DataXu: "How DataXu scaled its System to handle billions of events with DynamoDB" -- https://youtu.be/lDiI0JMf_yQ?t=765 (from AWS re:Invent 2016)

- Lyft: “Lyft Easily Scales Up its Ride Location Tracking System with Amazon DynamoDB” -- https://www.youtube.com/watch?v=WlTbaPXj-jc. The story "AWS Helps Fuel Lyft's Expansion" in InformationWeek mentions Lyft's use of DynamoDB as well: http://www.informationweek.com/cloud/infrastructure-as-a-ser...

- Under Armour implemented cross-region replication using DynamoDB: https://youtu.be/NtaTC2Fq7Wo?t=699

- Amazon.com: Amazon Marketplace shares their story of migration to DynamoDB and why they did it: https://www.youtube.com/watch?v=gllNauRR8GM

Finally, DynamoDB was created because Amazon needed a highly reliable and scalable key/value database. As Werner Vogels said it in his blog post announcement of DynamoDB back in 2012 (http://www.allthingsdistributed.com/2012/01/amazon-dynamodb....):

"This non-relational, or NoSQL, database was targeted at use cases that were core to the Amazon ecommerce operation, such as the shopping cart and session service."

Re:There are very few suitable use cases for DynamoDB on Monday July 10, 2017 @07:37PM (#14740525)
Full disclosure: I am a member of DynamoDB team at AWS, but my opinions here are mine only

Here are some of DynamoDB customers describing their use cases:

- DataXu: "How DataXu scaled its System to handle billions of events with DynamoDB" -- https://youtu.be/lDiI0JMf_yQ?t=765 (from AWS re:Invent 2016)

- Lyft: “Lyft Easily Scales Up its Ride Location Tracking System with Amazon DynamoDB” -- https://www.youtube.com/watch?v=WlTbaPXj-jc. The story "AWS Helps Fuel Lyft's Expansion" in InformationWeek mentions Lyft's use of DynamoDB as well: http://www.informationweek.com/cloud/infrastructure-as-a-ser...

- Under Armour implemented cross-region replication using DynamoDB: https://youtu.be/NtaTC2Fq7Wo?t=699

- Amazon.com: Amazon Marketplace shares their story of migration to DynamoDB: https://www.youtube.com/watch?v=gllNauRR8GM

Finally, DynamoDB was created because Amazon needed a highly reliable and scalable key/value database. As Werner Vogels said it in his blog post announcement of DynamoDB back in 2012 (http://www.allthingsdistributed.com/2012/01/amazon-dynamodb....):

"This non-relational, or NoSQL, database was targeted at use cases that were core to the Amazon ecommerce operation, such as the shopping cart and session service."

Re:Ask HN: What is a good espresso machine? on Friday July 02, 2010 @01:24PM (#1481691)
Gaggia Classic is very good. It's the same machine type as Rancilio Silvia, and about $150-200 cheaper. I can't claim that it's better as I have never owned Rancilio, but it's definitely worth considering.