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System Azure Cosmos DB RiakDB
 Name Azure Cosmos DB Riak
 Version NA 2.2.0 (released Nov 17)
 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 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 NA 1.http calls for crud operations(unlike sql queries) 2.multi-datacenter replication
 Languages Supported .net, C#, Javascript Ruby, Java, Erlang and Python
 Website www.azure.microsoft.com/­services/­cosmos-db www.basho.com
 XML Support no NA
 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) 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 DB Key Value Store
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db https://docs.basho.com/
 License commercial on azure cloud. Open Source. Multi Data Centre Replication needs an enterprise license
 Cloud-based / SaaS Azure Cloud based SaaS options AWS-https://aws.amazon.com/marketplace/pp/B00AMRXCQA/ref=mkt_m3_riak, On-Prem available as well
 Implementation Language NA Erlang
 Operating System Supported Linux , OS X, Windows Linux , OS X, Windows
 Options for Integration / Access API Rest API , MongoDB drivers Rest API, ProtocolBuffers, Native Erlang Interface
 Consistency Eventual consistency Eventual consistency
 Foreign Keys No No
 Streaming Support No No
 Analytics Support NA No
 Data Storage Schema Multi Model Database Key Value Store with separate instances for timeseries,key-value and storage
 Notable Users -- weather.com,bestbuy.com,nhs.co.uk,github.com
 Key Differentiator -- Multi DataCenter Replication. This feature is not offered by any other nosql vendor
 Concurrency -- Yes
 Partitioning -- Sharding
 Replication -- Multi Data Center Replication supported