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System Apache Cassandra IBM DB2
 Version 3 Last Stable Release 11.1 , released in april 2016
 Drawbacks community support only available high license costs. Applicable for transaction systems in large enterprises
 Name Apache Cassandra IBM DB2
 Advantages Open Source Columnar NoSQL Database with excellent performance ACID compliant.
 Languages Supported C C# C++ Java Node.js PHP Python Ruby C C# C++ Cobol Delphi Fortran Java JCL Perl PHP Python Ruby Visual Basic
 Website www.datastax.com/products/datastax-enterprise www.ibm.com/­analytics/­us/­en/­db2
 XML Support no yes
 JSON Support yes yes
 Brief description 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. 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 Primarily a NoSQL database Primarily a relational database
 Technical Documentation docs.datastax.com www.ibm.com/­support/­knowledgecenter/­SSEPGG
 License Commercial Commercial
 Cloud-based / SaaS Virtual Machine Images available in AWS Azure and Google Cloud Marketplace. https://bitnami.com/stack/cassandra/cloud/aws Available in AWS, Azure Clouds. Available as a SaaS option in IBM Cloud
 Implementation Language C,C++ C,C++
 Operating System Supported Linux OS X Solaris Windows Linux Windows
 Options for Integration / Access API CQL (Cassandra Query Language is like SQL) Thrift Protocol JSON Query, Xquery, JDBC, ODBC
 Consistency Highly Consistent Highly Consistent
 Foreign Keys No Yes
 Streaming Support Yes No
 Analytics Support One of the core features is to build timeseries apps Need to buy Netezza
 Data Storage Schema Key Value Column Family NoSQL DB Relational Database
 Notable Users Samsung Smartthings, ING Vysya , Safeway Most of the Fortune 500 Companies
 Key Differentiator Open Source NoSQL DB. The GoTo DB for Columnar NoSQL databases Go To Database for IBM Mainframe Systems
 Concurrency Yes Yes
 Partitioning Yes No
 Replication Yes - Tunable Master-Slave Replication Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes No
 SQL Query No, but CQL is similar to SQL Yes