1. Virtuoso：
它是一种中间件，支持对表示为关系表和/或属性图的数据进行管理。它是一个多模型混合型RDBMS，它拥有主要数据库模型，如Graph DBMS，Native XML DBMS，Relational DBMS，RDF存储，搜索引擎。它旨在利用操作系统线程支持和多个CPU的优势。 Virtuoso对象关系数据库(ORDBMS)支持实体完整性和引用完整性。
2. Valentina服务器：
它是一个对象关系数据库和报表服务器以及快速的对象关系数据库服务器。它包括集成数据库服务器，Valentina数据库服务器和SQLite数据库服务器。它是一个功能全面，符合标准的，基于多用户访问的基于SQLite的数据库服务器。
Valentina Server和Virtuoso之间的区别：
| S.NO. | Valentina Server | Virtuoso |
|---|---|---|
| 1 | Developed by Paradigma Software and initially released on 1994 and Current release of Valentina Server is 5.7.5 . | Developed by Virtuoso and initially released on 1998 and current release on May 2019. |
| 2 | Server operating systems of Valentina Server is Linux, OS X, Windows. | Server operating systems- AIX, FreeBSD, HP-UX, Linux, OS X, Solaris, Windows. |
| 3 | Its primary database model is Relational DBMS. | Its primary database model is Graph DBMS, Native XML DBMS, Relational DBMS, RDF store, Search engine and its secondary database models is Document store.. |
| 4 | Valentina Server supports .Net, C, C#, C++, Objective-C, PHP, Ruby, Visual Basic, Visual Basic.NET, programming languages. | Virtuoso supports .Net, C, C#, C++, Java, JavaScript, Perl, PHP, Python, Ruby, Visual Basic programming languages. |
| 5 | APIs and other access methods of Valentina Server is ODBC. | 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. |
| 6 | Yes, Valentina Server has a Data Schema. | Yes, Virtuoso has a Data Schema. |
| 7 | It doesn’t has Implementation language-C# . | Implementation language of Virtuoso is C. |
| 8 | Absence of Transaction concepts in Valentina Server. | Its transaction concept is ACID ( Atomicity, Consistency, Isolation, and Durability). |
| 9 | Valentina Server doesn’t hold Consistency concept. | Yes, Virtuoso has Consistency concept. |
| 10 | Yes, It holds Foreign keys. | It holds Foreign keys. |
| 11 | Absence of Replication methods in Valentina Server. | Replication methods of Virtuoso is based on Chain, star, and bi-directional replication, Master-master replication, Master-slave replication. |
| 12 | Absence of Partitioning methods in Valentina Server. | It doesn’t holds sharding partitioning methods. |