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System AWS DynamoDB PostgresDB
 Name Amazon DynamoDB Postgres SQL
 Version released Jan 2012 10.5 release in august 2018
 Drawbacks Very few features when compared to other key-value stores Primarily a relational database
 Advantages Managed Database Service provided by a leading cloud provider Open Source Database with a nice ecosystem with periodic upgrades
 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 postgresql.org
 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 PostgreSQL, often simply Postgres, is an object-relational database management system (ORDBMS) with an emphasis on extensibility and standards compliance. It can handle workloads ranging from small single-machine applications to large Internet-facing applications (or for data warehousing) with many concurrent users; on macOS Server, PostgreSQL is the default database and it is also available for Microsoft Windows and Linux (supplied in most distributions). PostgreSQL is ACID-compliant and transactional. PostgreSQL has updatable views and materialized views, triggers, foreign keys; supports functions and stored procedures, and other expandability. PostgreSQL is developed by the PostgreSQL Global Development Group, a diverse group of many companies and individual contributors.It is free and open-source, released under the terms of the PostgreSQL License, a permissive software license.
 Database Model Key Value Model Primarily a relational database
 Technical Documentation aws.amazon.com/­documentation/­dynamodb www.postgresql.org/­docs/­manuals
 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 and Azure SaaS Option - Available in Google Cloud
 Implementation Language C++ C,C++
 Operating System Supported Linux , OS X, Windows FreeBSD, HP-UX, Linux, OS X, Solaris, Unix, Windows
 Options for Integration / Access API Rest API Native C library 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 startups and SMEs use this stable open source database with a nice ecosystem of tools supporting it
 Key Differentiator Amazon allows developers to purchase a service based on throughput, rather than storage. Go to Open Source Database. Earlier Mysql was the most popular but new features have been slow after oracle acquisition.
 Concurrency Yes Yes
 Partitioning Sharding No
 Replication Multi Data Center Replication supported Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes No
 SQL Query No Yes