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System ElasticSearch PostgresDB
 Name ElasticSearch Postgres SQL
 Version Version 6.4.1 (released in September 2018) 10.5 release in august 2018
 Drawbacks Elasticsearch AMI not available Primarily a relational database
 Advantages Large number of drivers present for integration Open Source Database with a nice ecosystem with periodic upgrades
 Languages Supported .Net Groovy Java JavaScript Perl PHP Python Ruby C C# C++ Cobol Delphi Fortran Java JCL Perl PHP Python Ruby Visual Basic
 Website www.elastic.co/­products/­elasticsearch postgresql.org
 XML Support no yes
 JSON Support yes yes
 Brief description Elasticsearch is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. 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 NoSQL Model Primarily a relational database
 Technical Documentation www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html www.postgresql.org/­docs/­manuals
 License Open Source. Commercial version with HA available with redislabs.com Commercial
 Cloud-based / SaaS ElasticSearch Cloud Cluster available from ElasticSearch 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 Proprietary protocol using JSON Native C library JDBC ODBC
 Consistency Highly Consistent Highly Consistent
 Foreign Keys No Yes
 Streaming Support Yes No
 Analytics Support NA Need to buy Netezza
 Data Storage Schema Inverted Index 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 No known Enterprise Competitor apart from Amazaon Cloud Search 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 Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes No
 SQL Query No Yes