1.德比：
Derby 是一个用Java实现的功能齐全的开源关系数据库管理系统 (RDBMS)，顾名思义，它是由 Apache Software Foundations 开发的。它基于Java、JDBC 和 SQL 标准。 Derby 易于安装、部署和使用。它要么嵌入到Java应用程序中，要么用作数据库服务器。
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。
Derby 和 IBM Db2 之间的区别：
| SR.NO. | Derby | IBM Db2 |
|---|---|---|
| 1 | It is developed by Apache Software Foundation in 1997. | It is developed by IBM in 1983. |
| 2 | It is written in Java language. | It is written in C, C++, Assembly language, Java languages. |
| 3 | Server operating systems for Derby are Windows, macOs, Linux, Unix, BSD and z/OS. | Db2 server operating systems are AIX, HP-UX, Linux, Solaris, Windows and z/OS. |
| 4 | The primary database model for Derby is Relational DBMS. | The primary database model for IBM Db2 is Relational DBMS. |
| 5 | It is a open source software framework. | It is a commercial databases. |
| 6 | It supports only Java programming language. | It supports C, C++, Cobol, Java, Perl, PL/1, Python, R, Ruby. |
| 7 | It supports fine grained access rights according to SQL-standard. | It also support fine grained access rights according to SQL-standard. |
| 8 | It provides in-memory capabilities. | It do not provide in-memory capabilities. |