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System AWS Aurora RiakDB
 Name AWS Aurora Riak
 Version Version 4.2.8 2.2.0 (released Nov 17)
 Drawbacks NA 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 RDBMS from AWS 1.http calls for crud operations(unlike sql queries) 2.multi-datacenter replication
 Languages Supported Content Management Interoperability Services (CMIS) Ruby, Java, Erlang and Python
 Website aws.amazon.com/rds/aurora/ www.basho.com
 XML Support no NA
 JSON Support yes yes
 Brief description Aurora is available as part of the Amazon Relational Database Service (RDS). Although it is a proprietary technology it offers MySQL compatible service since its release . This was made PostgreSQL compatible since October 2017 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 Relational Database Key Value Store
 Technical Documentation https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Overview.html https://docs.basho.com/
 License Commercial Open Source. Multi Data Centre Replication needs an enterprise license
 Cloud-based / SaaS SaaS Service from AWS 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 Not Applicable as its managed by AWS Linux , OS X, Windows
 Options for Integration / Access API Restful HTTP Rest API, ProtocolBuffers, Native Erlang Interface
 Consistency NA Eventual consistency
 Foreign Keys Yes No
 Streaming Support Yes No
 Analytics Support NA No
 Data Storage Schema NA Key Value Store with separate instances for timeseries,key-value and storage
 Notable Users NA weather.com,bestbuy.com,nhs.co.uk,github.com
 Key Differentiator Supports MySQL as a SaaS service (Inno Db Engine). Disk Space provisioning done in 10 GB chunks automatically upto 64 TB. Multi DataCenter Replication. This feature is not offered by any other nosql vendor
 Concurrency Yes Yes
 Partitioning No Sharding
 Replication Yes Multi Data Center Replication supported
 Secondary Indexes Yes based on secondary indexes using Solr --
 SchemaLess Yes --
 SQL Query No --