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 是一个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.阿里云云数据库PolarDB：
云数据库PolarDB是一个兼容MySQL、PostgreSQL、Oracle的云原生关系型数据库。云数据库架构在单个集群中支持 5000 台物理机。它专为需要快速性能、高并发和自动扩展的业务关键型数据库应用程序而设计。
Adabas与阿里云PolarDB的区别：
| S.NO. | ADABAS | Alibaba Cloud ApsaraDB for PolarDB |
|---|---|---|
| 1. | It was developed by Software AG in 1971. | It was developed by Alibaba on August 2013. |
| 2. | It is an OLTP-DBMS for mainframes and Linux/Unix/Windows environments. | It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle. |
| 3. | It does not support in-memory capabilities. | It supports in-memory capabilities. |
| 4. | Server operating systems for Adabas are BS2000, Linux, Unix, Windows, z/OS and z/VSE. | In Alibaba Cloud ApsaraDB for PolarDB there are hosted server operating systems. |
| 5. | It does not support XML Format. | It supports XML Format. |
| 6. | Server-side scripting is done in Natural language. | It also supports the Server-side scripting. |
| 7. | It supports partitioning methods. | Supported partitioning method is Sharding. |
| 8. | It supports SQL query language with add-on product Adabas SQL Gateway. | It also supports SQL query language. |
| 9. | It supports Replication with add-on product Event Replicator. | It also supports replication methods. |
| 10. | Adabas does not provide the concept of Referential Integrity. Hence, no Foreign Keys. | ApsaraDB for PolarDB provides the concept of Referential Integrity. Hence, there are Foreign Keys. |
| 11. | The license of Adabas is commercial. | The license of Alibaba Cloud ApsaraDB for PolarDB is also commercial. |
| 12. | The primary database model of Adabas is Multivalue DBMS. | The primary database model is Relational DBMS. |