1. VelocityDB :
It is .NET Object Database that can be embedded/distributed and extended to a graph data model (VelocityGraph) Database is fast and low memory consuming. VelocityDB is an extremely high performance, easy to use, scalable, embeddable, and distributable object database system.
2. Virtuoso :
It is middleware that supports management of data represented as relational tables and/or property graphs. It is a multi-model hybrid-RDBMS that holds primary database model as Graph DBMS, Native XML DBMS, Relational DBMS, RDF store, Search engine. It is designed for taking advantage of operating system threading support and multiple CPUs. Virtuoso Object-relational database (ORDBMS) supports entity integrity and referential integrity.
Difference between VelocityDB and Virtuoso :
|It is developed by VelocityDB Inc and initially released on 2011 .||It is developed by Virtuoso and initially released on 1998.|
|Its server operating systems of VelocityDB is Any that supports .NET||Its server operating systems of AIX, FreeBSD, HP-UX, Linux, OS X, Solaris, Windows.|
|Its primary database model is Graph DBMS and Object oriented DBMS||Its primary database model is Graph DBMS, Native XML DBMS, Relational DBMS, RDF
store, Search engine.
|Absence of Secondary database models in VelocityDB||Secondary database models of YugabyteDB is Document store.|
|APIs and other access methods of VelocityDB is .Net||Virtuoso supports ADO.NET, GeoSPARQL, HTTP API, JDBC, Jena, RDF API, ODBC, OLE DB, RDF4J API, RESTful HTTP API, Sesame REST HTTP Protocol, SOAP, webservices, WebDAV, XPath, XQuery, XSLT.|
|It has Implementation language-C# .||Implementation language of Virtuoso is C.|
|Its transaction concepts is ACID (atomicity, Consistency, Isolation, and Durability).||It has transaction concept- ACID (atomicity, Consistency, Isolation, and Durability).|
|Absence of Replication methods.||Replication methods of Virtuoso is based on Chain, star, and bi-directional replication, Master-master replication, Master-slave replication.|
|It has Immediate Consistency concept.||It has Consistency concept.|
|Partitioning methods of VelocityDB is Sharding.||There is no partitioning methods.|
|It has not concept of Foreign keys||It has concept of Foreign keys|
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