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System Azure Cosmos DB Apache Cassandra
 Version NA 3
 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 community support only available
 Name Azure Cosmos DB Apache Cassandra
 Advantages NA Open Source Columnar NoSQL Database with excellent performance
 Languages Supported .net, C#, Javascript C C# C++ Java Node.js PHP Python Ruby
 Website www.azure.microsoft.com/­services/­cosmos-db www.datastax.com/products/datastax-enterprise
 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) MongoDB is a free and open-source cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with schemata. MongoDB is developed by MongoDB Inc.
 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 Azure and Google Cloud Marketplace. https://bitnami.com/stack/cassandra/cloud/aws
 Implementation Language NA C,C++
 Operating System Supported Linux , OS X, Windows Linux OS X Solaris Windows
 Options for Integration / Access API Rest API , MongoDB drivers CQL (Cassandra Query Language is like SQL) Thrift Protocol
 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 -- Open Source NoSQL DB. The GoTo DB for Columnar NoSQL databases
 Concurrency -- Yes
 Partitioning -- Yes
 Replication -- Yes - Tunable Master-Slave Replication
 Secondary Indexes -- Yes
 SchemaLess -- Yes
 SQL Query -- No, but CQL is similar to SQL