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System AWS DynamoDB RiakDB
 Name Amazon DynamoDB Riak
 Version released Jan 2012 2.2.0 (released Nov 17)
 Drawbacks Very few features when compared to other key-value stores basho.com had funding problems and the company was sold to bet365.com in aug 2017. There is little clarity on product vision after the sale
 Advantages Managed Database Service provided by a leading cloud provider 1.http calls for crud operations(unlike sql queries) 2.multi-datacenter replication
 Languages Supported Java, Node.js, Go, C# .NET, Perl, PHP, Python, Ruby, Haskell and Erlang. Ruby, Java, Erlang and Python
 Website aws.amazon.com/­dynamodb www.basho.com
 XML Support no NA
 JSON Support yes yes
 Brief description Amazon DynamoDB is a fully managed proprietary NoSQL database service that supports key-value and document data structures[2] and is offered by Amazon.com as part of the Amazon Web Services portfolio Distributed NoSQL key-value data store that offers high availability, fault tolerance, operational simplicity, and scalability. There are three variants riakkv (keyvalue), riakts(time series) and riakcs (distributed storage)
 Database Model Key Value Model Key Value Store
 Technical Documentation aws.amazon.com/­documentation/­dynamodb https://docs.basho.com/
 License commercial on aws cloud. Open Source. Multi Data Centre Replication needs an enterprise license
 Cloud-based / SaaS Yes but you can download dynamod db locally as well. Local installation does not have vendor support SaaS options AWS-https://aws.amazon.com/marketplace/pp/B00AMRXCQA/ref=mkt_m3_riak, On-Prem available as well
 Implementation Language C++ Erlang
 Operating System Supported Linux , OS X, Windows Linux , OS X, Windows
 Options for Integration / Access API Rest API Rest API, ProtocolBuffers, Native Erlang Interface
 Consistency Immediate consistency Eventual consistency
 Foreign Keys No No
 Streaming Support No No
 Analytics Support NA No
 Data Storage Schema Key Value Model Key Value Store with separate instances for timeseries,key-value and storage
 Notable Users As per Amazon the solution has been deployed by around 100,000 customers weather.com,bestbuy.com,nhs.co.uk,github.com
 Key Differentiator Amazon allows developers to purchase a service based on throughput, rather than storage. Multi DataCenter Replication. This feature is not offered by any other nosql vendor
 Concurrency Yes Yes
 Partitioning Sharding Sharding
 Replication Multi Data Center Replication supported Multi Data Center Replication supported
 Secondary Indexes Yes --
 SchemaLess Yes --
 SQL Query No --