1.阿达巴斯：
Adabas 代表自适应数据库系统。它由 Software AG 开发，可在 IBM 大型机上运行。它于 1971 年推出。它是一个用于大型机和 Linux/Unix/Windows 环境的 OLTP-DBMS。 ADABAS 是一种企业数据库管理系统 (DBMS)，专为可靠性、高性能、可扩展性和低总体拥有成本而设计。
2. 沙发床：
Couchbase Server 是一个开源、分布式、多模型 NoSQL 面向文档的数据库软件包，针对交互式应用程序进行了优化。它也被称为 Membase。它由 Couchbase, Inc. 开发，最初于 2010 年 8 月发布。
Adabas 和 Couchbase 的区别：
| S.No. | ADABAS | Couchbase |
|---|---|---|
| 1. | It was developed By Software AG in 1971. | It was developed by Couchbase, Inc. and initially released in August 2011. |
| 2. | It is an OLTP-DBMS for mainframes and Linux/Unix/Windows environments. | It is a JSON-based document store derived from CouchDB with a Memcached-compatible interface. |
| 3. | Adabas is written in Natural language. | Couchbase is written in C++, Erlang, C and Go languages. |
| 4. | Server operating systems for Adabas are BS2000, Linux, Unix, Windows, z/OS and z/VSE. | Server operating systems for Couchbase are Linux, OS X and Windows. |
| 5. | It supporta Data schema. | It is schema free. |
| 6. | Server-side scripting is done in Natural language. | It has functions and timers in JavaScript for Server-side scripts. |
| 7. | It supports partitioning methods. | In Couchbase, partitioning can be done by sharding. |
| 8. | It supports SQL query language with add-on product Adabas SQL Gateway. | It supports Declarative query language (N1QL) that extends ANSI SQL to JSON. First commercial implementation of SQL++. |
| 9. | It supports Replication with add-on product Event Replicator. | It support two replication methods : Master-master replication and Master-slave replication. |
| 10. | Adabas does not provide the concept of Referential Integrity. Hence, no Foreign Keys. | Couchbase also does not provide the concept of Referential Integrity. Hence, no Foreign Keys. |
| 11. | The license of Adabas is commercial. | The license of Couchbase is open-source. |
| 12. | The primary database model of Adabas is Multivalue DBMS. | The primary database models of Couchbase is Document store. |
| 13. | It does not support in-memory capabilities. | It supports in-memory capabilities. |