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System AllegroGraph ElasticSearch
 Name AllegroGraph ElasticSearch
 Version AllegroGraph 6.4.2 [2018-06-18] Version 6.4.1 (released in September 2018)
 Drawbacks NA Elasticsearch AMI not available
 Advantages -Database being explicitly pre-structured
-Data to self-define the schema at the time of ingest
-Able to connect concepts, properties, and entities across multiple databases and without further coding to extract new, actionable business insights from your data
Large number of drivers present for integration
 Website www.allegrograph.com,
 Languages Supported Java, Python, Ruby, Perl, C#, Clojure and Common Lisp .Net Groovy Java JavaScript Perl PHP Python Ruby
 JSON Support yes yes
 XML Support yes no
 Brief description -Modern, high-performance, persistent graph database
-Uses efficient memory utilization in combination with disk-based storage, enabling it to scale to billions of quads while maintaining superior performance
-Supports SPARQL, RDFS++ and Prolog reasoning from numerous applications
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 Graph Database, A triplestore or RDF store Key Value NoSQL Model
 Technical Documentation franz.com/agraph/support/documentation/current/agraph-introduction.html 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 No ElasticSearch Cloud Cluster available from ElasticSearch
 Implementation Language Common Lisp C,C++
 Operating System Supported Windows, Linux, and Mac OS X Linux OS X Solaris Windows
 Options for Integration / Access API Java, Python, Common Lisp and other APIs Proprietary protocol using JSON
 Consistency Yes Highly Consistent
 Foreign Keys No No
 Streaming Support Yes Yes
 Data Storage Schema Yes Inverted Index
 Analytics Support Yes, AllegroGraph Recognized Among Top 10 Analytics Solution Providers by Pharma Tech Outlook for 2016 NA
 Notable Users -- --
 Key Differentiator -- No known Enterprise Competitor apart from Amazaon Cloud Search
 Concurrency -- Yes
 Partitioning -- Yes
 Replication -- Yes
 Secondary Indexes -- Yes
 SchemaLess -- Yes
 SQL Query -- No