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System Cassandra (Datastax) AllegroGraph
 Version 2.1 AllegroGraph 6.4.2 [2018-06-18]
 Drawbacks Paid Version, License Fees, Support Fees NA
 Advantages DB Failover capability, Enterprise support available -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
 Website www.datastax.com www.allegrograph.com,
 XML Support Not Available.Generally not available in NOSQL DB. Well known RDBMS have this feature yes
 Name Cassandra (Datastax) AllegroGraph
 Languages Supported C C# C++ Java Node.js PHP Python Ruby Java, Python, Ruby, Perl, C#, Clojure and Common Lisp
 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 -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
 Database Model Primarily a NoSQL database Graph Database, A triplestore or RDF store
 Technical Documentation docs.datastax.com franz.com/agraph/support/documentation/current/agraph-introduction.html
 License Commercial Commercial
 Cloud-based / SaaS Virtual Machine Images available in AWS and Azure Marketplace. Available as a Hybrid Cloud SaaS Option - NA No
 Implementation Language C,C++ Common Lisp
 Operating System Supported Linux, OS X, Windows, Linux, and Mac OS X
 Options for Integration / Access API CQL (Cassandra Query Language is like SQL) Gremlin Java, Python, Common Lisp and other APIs
 Consistency Highly Consistent Yes
 Foreign Keys No No
 Streaming Support Yes Yes
 Data Storage Schema Key Value Column Family NoSQL DB Yes
 Analytics Support One of the core features is to build timeseries apps Yes, AllegroGraph Recognized Among Top 10 Analytics Solution Providers by Pharma Tech Outlook for 2016
 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) --
 Concurrency Yes --
 Partitioning Yes --
 Replication Yes --
 Secondary Indexes Yes --
 SchemaLess Yes --
 SQL Query No, but CQL is similar to SQL --