1. Adabas：
Adabas代表可调整的数据库系统。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)，旨在实现可靠性，高性能，可伸缩性和较低的总体拥有成本。
2.适用于PolarDB的阿里云ApsaraDB：
ApsaraDB for PolarDB是与MySQL，PostgreSQL和Oracle兼容的云原生关系数据库。 ApsaraDB体系结构在单个群集中支持5000台物理机。它是为需要快速性能，高并发性和自动伸缩的关键业务数据库应用程序而设计的。
用于PolarDB的Adabas与阿里云ApsaraDB之间的区别：
| 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. |