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System Azure Cosmos DB IBM DB2
 Name Azure Cosmos DB IBM DB2
 Version NA Last Stable Release 11.1 , released in april 2016
 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 high license costs. Applicable for transaction systems in large enterprises
 Advantages NA ACID compliant.
 Languages Supported .net, C#, Javascript C C# C++ Cobol Delphi Fortran Java JCL Perl PHP Python Ruby Visual Basic
 Website www.azure.microsoft.com/­services/­cosmos-db www.ibm.com/­analytics/­us/­en/­db2
 XML Support no yes
 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) IBM Db2 was the name introduced by IBM in 1983. The names DB2(tm) and Db2(tm) refer to database-server products developed by IBM. IBM Researchers invented Relational model and SQL Format.
 Database Model Key Value DB Primarily a relational database
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db www.ibm.com/­support/­knowledgecenter/­SSEPGG
 License commercial on azure cloud. Commercial
 Cloud-based / SaaS Azure Cloud based Available in AWS, Azure Clouds. Available as a SaaS option in IBM Cloud
 Implementation Language NA C,C++
 Operating System Supported Linux , OS X, Windows Linux Windows
 Options for Integration / Access API Rest API , MongoDB drivers JSON Query, Xquery, JDBC, ODBC
 Consistency Eventual consistency Highly Consistent
 Foreign Keys No Yes
 Streaming Support No No
 Analytics Support NA Need to buy Netezza
 Data Storage Schema Multi Model Database Relational Database
 Notable Users -- Most of the Fortune 500 Companies
 Key Differentiator -- Go To Database for IBM Mainframe Systems
 Concurrency -- Yes
 Partitioning -- No
 Replication -- Yes
 Secondary Indexes -- Yes
 SchemaLess -- No
 SQL Query -- Yes