1. Adabas：
Adabas代表适应性强的数据库系统。它是由Software AG开发的，可以在IBM大型机上运行。它于1971年推出。它是OLTP –适用于大型机和Linux / Unix / Windows环境的DBMS。它是企业数据库管理系统，旨在实现可靠性，高性能，可伸缩性和较低的总拥有成本。
2. Amazon SimpleDB：
它是Amazon托管的简单数据库服务，数据存储在Amazon Cloud中。这是Amazon Web服务，用于实时在结构化数据上运行查询。该数据库由Amazon.com用Erlang编写。它具有以下功能–高可用性和灵活性，几乎没有管理负担。
Adabas和Amazon SimpleDB之间的区别：
| S.No. | Adabas | Amazon SimpleDB |
|---|---|---|
| 1. | It was developed by Software AG in 1971. | It was developed by Amazon in 2007. |
| 2. | It is OLTP – DBMS for mainframes and Linux/Unix/Windows environments. | It is hosted simple database service by Amazon, with data stored in Amazon Cloud. |
| 3. | It is not available as cloud service. | It is available as cloud service. |
| 4. | Server operating systems for Adabas are BS2000, Linux, Unix, Windows, z/OS, and z/VSE. | In Amazon SimpleDB, Hosted server operating systems. |
| 5. | Its primary database model is Multivalue DBMS. | Its primary database model is key-value store. |
| 6. | Server-side scripting is done in Natural. | It does not support Server-side scripting. |
| 7. | It supports partitioning methods. | It does not support partitioning methods. |
| 8. | It supports SQL query language with add-on product Adabas SQL Gateway. | It does not supports SQL query language. |
| 9. | It supports Replication with add-on product Event Replicator. | It also supports replication methods. |
| 10. | It supports Natural as programming languages. | Programming languages supported are .Net, C, C++, Erlang, Java, PHP, Python, Ruby, and Scala. |