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System AWS DynamoDB IBM DB2
 Name Amazon DynamoDB IBM DB2
 Version released Jan 2012 Last Stable Release 11.1 , released in april 2016
 Drawbacks Very few features when compared to other key-value stores high license costs. Applicable for transaction systems in large enterprises
 Advantages Managed Database Service provided by a leading cloud provider ACID compliant.
 Languages Supported Java, Node.js, Go, C# .NET, Perl, PHP, Python, Ruby, Haskell and Erlang. C C# C++ Cobol Delphi Fortran Java JCL Perl PHP Python Ruby Visual Basic
 Website aws.amazon.com/­dynamodb www.ibm.com/­analytics/­us/­en/­db2
 XML Support no yes
 JSON Support yes yes
 Brief description Amazon DynamoDB is a fully managed proprietary NoSQL database service that supports key-value and document data structures[2] and is offered by Amazon.com as part of the Amazon Web Services portfolio 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 Model Primarily a relational database
 Technical Documentation aws.amazon.com/­documentation/­dynamodb www.ibm.com/­support/­knowledgecenter/­SSEPGG
 License commercial on aws cloud. Commercial
 Cloud-based / SaaS Yes but you can download dynamod db locally as well. Local installation does not have vendor support Available in AWS, Azure Clouds. Available as a SaaS option in IBM Cloud
 Implementation Language C++ C,C++
 Operating System Supported Linux , OS X, Windows Linux Windows
 Options for Integration / Access API Rest API JSON Query, Xquery, JDBC, ODBC
 Consistency Immediate consistency Highly Consistent
 Foreign Keys No Yes
 Streaming Support No No
 Analytics Support NA Need to buy Netezza
 Data Storage Schema Key Value Model Relational Database
 Notable Users As per Amazon the solution has been deployed by around 100,000 customers Most of the Fortune 500 Companies
 Key Differentiator Amazon allows developers to purchase a service based on throughput, rather than storage. Go To Database for IBM Mainframe Systems
 Concurrency Yes Yes
 Partitioning Sharding No
 Replication Multi Data Center Replication supported Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes No
 SQL Query No Yes