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System Cassandra (Datastax) ElasticSearch
 Version 2.1 Version 6.4.1 (released in September 2018)
 Drawbacks Paid Version, License Fees, Support Fees Elasticsearch AMI not available
 Advantages DB Failover capability, Enterprise support available Large number of drivers present for integration
 Website www.datastax.com www.elastic.co/­products/­elasticsearch
 XML Support Not Available.Generally not available in NOSQL DB. Well known RDBMS have this feature no
 Name Cassandra (Datastax) ElasticSearch
 Languages Supported C C# C++ Java Node.js PHP Python Ruby .Net Groovy Java JavaScript Perl PHP Python Ruby
 JSON Support yes yes
 Brief description DataStax was built on the open source NoSQL database Apache Cassandra. Cassandra was initially developed internally at Facebook to handle large data sets across multiple servers. It was released as an Apache open source project in 2008 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.
 Database Model Primarily a NoSQL database Key Value NoSQL Model
 Technical Documentation docs.datastax.com www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html
 License Commercial Open Source. Commercial version with HA available with redislabs.com
 Cloud-based / SaaS Virtual Machine Images available in AWS and Azure Marketplace. Available as a Hybrid Cloud SaaS Option - NA ElasticSearch Cloud Cluster available from ElasticSearch
 Implementation Language C,C++ C,C++
 Operating System Supported Linux, OS X, Linux OS X Solaris Windows
 Options for Integration / Access API CQL (Cassandra Query Language is like SQL) Gremlin Proprietary protocol using JSON
 Consistency Highly Consistent Highly Consistent
 Foreign Keys No No
 Streaming Support Yes Yes
 Analytics Support One of the core features is to build timeseries apps NA
 Data Storage Schema Key Value Column Family NoSQL DB Inverted Index
 Notable Users Samsung Smartthings, ING Vysya , Safeway --
 Key Differentiator Graph DB built natively on top of the core NoSQL Column Store. Graph and NoSQL component share the same core. Enterprise version of Cassandra supports HighAvailability (HA) No known Enterprise Competitor apart from Amazaon Cloud Search
 Concurrency Yes Yes
 Partitioning Yes Yes
 Replication Yes Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes Yes
 SQL Query No, but CQL is similar to SQL No