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System Azure Cosmos DB PostgresDB
 Name Azure Cosmos DB Postgres SQL
 Version NA 10.5 release in august 2018
 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 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 www.azure.microsoft.com/­services/­cosmos-db postgresql.org
 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) 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 DB Primarily a relational database
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db www.postgresql.org/­docs/­manuals
 License commercial on azure cloud. Commercial
 Cloud-based / SaaS Azure Cloud based Available in AWS and Azure SaaS Option - Available in Google Cloud
 Implementation Language NA 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 , MongoDB drivers Native C library 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 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