1. Couchbase：
Couchbase Server是一个开放源代码的分布式JSON文档数据库，为交互式应用程序提供了增强。它也被称为Membase。它由Couchbase，Inc.开发，最初于2010年8月发布。它使用C++，Erlang，C，Go语言编写，其服务器旨在为我们提供易于扩展的键值或JSON文档访问，且访问权限高。持续的吞吐量和低延迟。
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。
Couchbase和IBM Db2之间的区别：
| SR.NO | Couchbase | IBM Db2 |
|---|---|---|
| 1 | It is developed by Couchbase, Inc. in 2010 | It is developed by IBM in 1983. |
| 2 | It is written in C++, Erlang, C and Go languages. | It is written in C, C++, Assembly language, Java languages. |
| 3 | The primary database model for Couchbase is Document Store. | The primary database model for Db2 is Relational DBMS. |
| 4 | Server operating systems for Couchbase are Linux, OS X and Windows. | Server operating systems for Db2 are AIX, HP-UX, Linux, Solaris, Windows and z/OS. |
| 5 | It does not have the concept of Foreign keys. | It has the concept of Referential Integrity and Foreign keys. |
| 6 | It supports Map Reduce method. | It does not support of Map Reduce method. |
| 7 | Famous companies like Lockwood Publishing, Code Weavers, MSLGROUP, The Doyle Group, etc uses Couchbase. | Famous companies like JPMorgan Chase, Bank of America, Scotiabank, Citi, etc use Db2. |
| 8 | It has free Data Schema. | It has fixed Data Schema. |