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System Apache Cassandra PostgresDB
 Version 3 10.5 release in august 2018
 Drawbacks community support only available Primarily a relational database
 Name Apache Cassandra Postgres SQL
 Advantages Open Source Columnar NoSQL Database with excellent performance Open Source Database with a nice ecosystem with periodic upgrades
 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 postgresql.org
 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. 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 Primarily a NoSQL database Primarily a relational database
 Technical Documentation docs.datastax.com www.postgresql.org/­docs/­manuals
 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 and Azure SaaS Option - Available in Google Cloud
 Implementation Language C,C++ C,C++
 Operating System Supported Linux OS X Solaris Windows FreeBSD, HP-UX, Linux, OS X, Solaris, Unix, Windows
 Options for Integration / Access API CQL (Cassandra Query Language is like SQL) Thrift Protocol Native C library 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 startups and SMEs use this stable open source database with a nice ecosystem of tools supporting it
 Key Differentiator Open Source NoSQL DB. The GoTo DB for Columnar NoSQL databases Go to Open Source Database. Earlier Mysql was the most popular but new features have been slow after oracle acquisition.
 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