1. 关系型数据库：
RDBMS 代表关系数据库管理系统。它是最受欢迎的数据库。其中数据以行的形式存储，即元组的形式。它包含许多表，数据可以轻松访问，因为数据存储在表中。该模型由 EF 提出
2.IBM Db2：
IBM Db2 是由 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)，支持面向对象的特性和非关系结构的 XML。 Db2 旨在高效地存储、分析和检索数据。它最初于 1983 年发布，使用 C、C++、 Java和汇编语言编写。
RDBMS 和 IBM DB2 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. |