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System AWS DynamoDB CouchDB
 Name Amazon DynamoDB CouchDB
 Version released Jan 2012 3.3.5
 Drawbacks Very few features when compared to other key-value stores 1 Does not have capabilities present in an RDF data store e.g does not support SparQL
 Advantages Managed Database Service provided by a leading cloud provider NA
 Languages Supported Java, Node.js, Go, C# .NET, Perl, PHP, Python, Ruby, Haskell and Erlang. .net, C#, Javascript
 Website aws.amazon.com/­dynamodb apache.couchdb.org
 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 Open Source Transactional database with native graph storage and processing
 Database Model Key Value Model Property Graph
 Technical Documentation aws.amazon.com/­documentation/­dynamodb docs.microsoft.com/­en-us/­azure/­cosmos-db
 License commercial on aws cloud. Community license can be run on 1 node.Enterprise License supports multi-node cluster deployment
 Cloud-based / SaaS Yes but you can download dynamod db locally as well. Local installation does not have vendor support Amazon AMI available, On Prem can be installed
 Implementation Language C++ Java API
 Operating System Supported Linux , OS X, Windows Linux , OS X, Windows
 Options for Integration / Access API Rest API Rest API
 Consistency Immediate consistency NA
 Foreign Keys No No
 Streaming Support No No
 Analytics Support NA No
 Data Storage Schema Key Value Model Key Value Store presented as Document DB
 Notable Users As per Amazon the solution has been deployed by around 100,000 customers --
 Key Differentiator Amazon allows developers to purchase a service based on throughput, rather than storage. --
 Concurrency Yes --
 Partitioning Sharding --
 Replication Multi Data Center Replication supported --
 Secondary Indexes Yes --
 SchemaLess Yes --
 SQL Query No --