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System CouchDB RiakDB
 Name CouchDB Riak
 Version 3.3.5 2.2.0 (released Nov 17)
 Drawbacks 1 Does not have capabilities present in an RDF data store e.g does not support SparQL 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 apache.couchdb.org www.basho.com
 XML Support NA NA
 JSON Support yes yes
 Brief description Open Source Transactional database with native graph storage and processing 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 Property Graph Key Value Store
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db https://docs.basho.com/
 License Community license can be run on 1 node.Enterprise License supports multi-node cluster deployment Open Source. Multi Data Centre Replication needs an enterprise license
 Cloud-based / SaaS Amazon AMI available, On Prem can be installed SaaS options AWS-https://aws.amazon.com/marketplace/pp/B00AMRXCQA/ref=mkt_m3_riak, On-Prem available as well
 Implementation Language Java API 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 NA Eventual consistency
 Foreign Keys No No
 Streaming Support No No
 Analytics Support No No
 Data Storage Schema Key Value Store presented as Document DB 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