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System Azure Cosmos DB AWS DynamoDB
 Name Azure Cosmos DB Amazon DynamoDB
 Version NA released Jan 2012
 Drawbacks 1.Most often compared with MongoDB. Unlike Mongo DB does not support joins 2.Managed Database which can be used only within Azure/Microsoft framework Very few features when compared to other key-value stores
 Advantages NA Managed Database Service provided by a leading cloud provider
 Languages Supported .net, C#, Javascript Java, Node.js, Go, C# .NET, Perl, PHP, Python, Ruby, Haskell and Erlang.
 Website www.azure.microsoft.com/­services/­cosmos-db aws.amazon.com/­dynamodb
 XML Support no no
 JSON Support yes yes
 Brief description 1.Globally distributed, horizontally scalable, multi-model database service 2.Earlier called Azure Document DB. Skype, Xbox uses this DB, Office, Active Directory and MSC (all Microsoft products) 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
 Database Model Key Value DB Key Value Model
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db aws.amazon.com/­documentation/­dynamodb
 License commercial on azure cloud. commercial on aws cloud.
 Cloud-based / SaaS Azure Cloud based Yes but you can download dynamod db locally as well. Local installation does not have vendor support
 Implementation Language NA C++
 Operating System Supported Linux , OS X, Windows Linux , OS X, Windows
 Options for Integration / Access API Rest API , MongoDB drivers Rest API
 Consistency Eventual consistency Immediate consistency
 Foreign Keys No No
 Streaming Support No No
 Analytics Support NA NA
 Data Storage Schema Multi Model Database Key Value Model
 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