1. RDBMS：
RDBMS代表关系数据库管理系统。它是最流行的数据库。在其中，数据以元组形式的行形式存储。它包含表的数目，并且由于数据存储在表中，因此可以轻松访问数据。该模型由EF提出
2. IBM Db2：
IBM Db2是IBM开发的一系列数据管理产品，包括数据库服务器。它是一个关系数据库管理系统(RDBMS)，它通过XML支持面向对象的功能和非关系结构。 Db2旨在有效地存储，分析和检索数据。它最初于1983年发布，并用C，C++， Java和汇编语言编写。
RDBMS和IBM DB2之间的区别：
| RDBMS | IBM DB2 |
|---|---|
| RDBMS was developed in 1989 by Microsoft. | IBM DB2 was developed in 1983 by IBM. |
| It is implemented in C++ programming language only. | It is implemented in C and C++ programming language. |
| LINUX and WINDOWS are the server operating system. | AIX, HP-UX, LINUX, SOLARIS, WINDOWS are the server operating system. |
| ADO.NET, JDBC, OLE DB, ODBC, Tabular data scheme are the access methods and API’s. | ADO.NET, JDBC, JSON style queries, ODBC, Xquery are the access methods and API’s. |
| Immediate consistency is achieved. | There is no immediate consistency in this. |
| RDBMS has high rating as compared to IBM DB2. | The rating of IBM DB2 is less than RDBMS. |
| It does not supports FORTRAN and PERL programming language. | It supports FORTRAN and PERL programming language. |
| It supports javascript (Node js). | It does not supports javascript. |
| Replication method is dependent on SQL server edition. | Replication method is not dependent on SQL server edition. |
| Document store and graph DBMS are secondary database model. | Document store and RDF store are secondary database model. |