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System Azure Cosmos DB Cassandra (Datastax)
 Version NA 2.1
 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 Paid Version, License Fees, Support Fees
 Advantages NA DB Failover capability, Enterprise support available
 Website www.azure.microsoft.com/­services/­cosmos-db www.datastax.com
 XML Support no Not Available.Generally not available in NOSQL DB. Well known RDBMS have this feature
 Name Azure Cosmos DB Cassandra (Datastax)
 Languages Supported .net, C#, Javascript C C# C++ Java Node.js PHP Python Ruby
 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) DataStax was built on the open source NoSQL database Apache Cassandra. Cassandra was initially developed internally at Facebook to handle large data sets across multiple servers. It was released as an Apache open source project in 2008
 Database Model Key Value DB Primarily a NoSQL database
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db docs.datastax.com
 License commercial on azure cloud. Commercial
 Cloud-based / SaaS Azure Cloud based Virtual Machine Images available in AWS and Azure Marketplace. Available as a Hybrid Cloud SaaS Option - NA
 Implementation Language NA C,C++
 Operating System Supported Linux , OS X, Windows Linux, OS X,
 Options for Integration / Access API Rest API , MongoDB drivers CQL (Cassandra Query Language is like SQL) Gremlin
 Consistency Eventual consistency Highly Consistent
 Foreign Keys No No
 Streaming Support No Yes
 Analytics Support NA One of the core features is to build timeseries apps
 Data Storage Schema Multi Model Database Key Value Column Family NoSQL DB
 Notable Users -- Samsung Smartthings, ING Vysya , Safeway
 Key Differentiator -- Graph DB built natively on top of the core NoSQL Column Store. Graph and NoSQL component share the same core. Enterprise version of Cassandra supports HighAvailability (HA)
 Concurrency -- Yes
 Partitioning -- Yes
 Replication -- Yes
 Secondary Indexes -- Yes
 SchemaLess -- Yes
 SQL Query -- No, but CQL is similar to SQL