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System CouchDB PostgresDB
 Name CouchDB Postgres SQL
 Version 3.3.5 10.5 release in august 2018
 Drawbacks 1 Does not have capabilities present in an RDF data store e.g does not support SparQL Primarily a relational database
 Advantages NA Open Source Database with a nice ecosystem with periodic upgrades
 Languages Supported .net, C#, Javascript C C# C++ Cobol Delphi Fortran Java JCL Perl PHP Python Ruby Visual Basic
 Website apache.couchdb.org postgresql.org
 XML Support NA yes
 JSON Support yes yes
 Brief description Open Source Transactional database with native graph storage and processing 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 Property Graph Primarily a relational database
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db www.postgresql.org/­docs/­manuals
 License Community license can be run on 1 node.Enterprise License supports multi-node cluster deployment Commercial
 Cloud-based / SaaS Amazon AMI available, On Prem can be installed Available in AWS and Azure SaaS Option - Available in Google Cloud
 Implementation Language Java API 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 NA Highly Consistent
 Foreign Keys No Yes
 Streaming Support No No
 Analytics Support No Need to buy Netezza
 Data Storage Schema Key Value Store presented as Document DB Relational Database
 Notable Users -- Most of the startups and SMEs use this stable open source database with a nice ecosystem of tools supporting it
 Key Differentiator -- Go to Open Source Database. Earlier Mysql was the most popular but new features have been slow after oracle acquisition.
 Concurrency -- Yes
 Partitioning -- No
 Replication -- Yes
 Secondary Indexes -- Yes
 SchemaLess -- No
 SQL Query -- Yes