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System ElasticSearch IBM DB2
 Name ElasticSearch IBM DB2
 Version Version 6.4.1 (released in September 2018) Last Stable Release 11.1 , released in april 2016
 Drawbacks Elasticsearch AMI not available high license costs. Applicable for transaction systems in large enterprises
 Advantages Large number of drivers present for integration ACID compliant.
 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 www.ibm.com/­analytics/­us/­en/­db2
 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. IBM Db2 was the name introduced by IBM in 1983. The names DB2(tm) and Db2(tm) refer to database-server products developed by IBM. IBM Researchers invented Relational model and SQL Format.
 Database Model Key Value NoSQL Model Primarily a relational database
 Technical Documentation www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html www.ibm.com/­support/­knowledgecenter/­SSEPGG
 License Open Source. Commercial version with HA available with redislabs.com Commercial
 Cloud-based / SaaS ElasticSearch Cloud Cluster available from ElasticSearch Available in AWS, Azure Clouds. Available as a SaaS option in IBM Cloud
 Implementation Language C,C++ C,C++
 Operating System Supported Linux OS X Solaris Windows Linux Windows
 Options for Integration / Access API Proprietary protocol using JSON JSON Query, Xquery, 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 Fortune 500 Companies
 Key Differentiator No known Enterprise Competitor apart from Amazaon Cloud Search Go To Database for IBM Mainframe Systems
 Concurrency Yes Yes
 Partitioning Yes No
 Replication Yes Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes No
 SQL Query No Yes