1. Trafodion：
它是Hadoop上的事务型SQL DBMS。它是Webscale SQL-on-Hadoop解决方案，支持Apache Hadoop上的事务或操作工作负载。 “ Trafodion”这个名字的发音是“ Tra-vod-eee-on”。它是一个在Apache Hadoop上运行的关系数据库管理系统，该系统使用并行感知的查询优化器为大数据环境中的事务或操作工作负载以及大数据集提供支持。
2. VelocityDB：
它是.NET对象数据库，可以嵌入/分发和扩展为图形数据模型(VelocityGraph)。数据库速度快，内存消耗低。它是一个非常高性能，易于使用，可伸缩，可嵌入和可分发的对象数据库系统。
Trafodion和VelocityDB之间的区别：
| S.NO. | Trafodion | VelocityDB |
|---|---|---|
| 1 | Developed by Apache Software Foundation, originally developed by HP and initially released on 2014. | Developed by VelocityDB Inc and initially released on 2011. |
| 2 | Current release on February 2019. | Current release of VelocityDB is 7.x. |
| 3 | Linux is server, operating systems of Trafodion . | .NET is server operating systems of VelocityDB. |
| 4 | Primary database model is Relational DBMS. | Primary database model is Graph DBMS and Object oriented DBMS. |
| 5 | All languages supporting JDBC/ODBC/ADO.Net are programming languages. | .Net is supporting programming languages. |
| 6 | ADO.NET, JDBC, ODBC are the APIs and other access methods of Trafodion. | APIs and other access methods of VelocityDB is .Net |
| 7 | Trafodion has Data Schema. | It also has a Data Schema. |
| 8 | It has Implementation language Java and C++ . | Implementation language of VelocityDB is C#. |
| 9 | Trafodion has ACID Transaction concepts. | ACID ( Atomicity, Consistency, Isolation, and Durability) is Transaction concepts. |
| 10 | Via HBase is replication methods of Trafodion. | Absence of Replication methods in VelocityDB. |
| 11 | Trafodion holds Immediate Consistency concept. | VelocityDB has Immediate Consistency concept. |
| 12 | It holds Foreign keys. | It does not hold Foreign keys. |