1. 阿里云云数据库PolarDB：
它是一个与 MySQL、PostgreSQL 和 Oracle 兼容的云原生关系数据库。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。
2.Altibase：
它是一个开源的关系数据库模型系统(RDBMS)。 Altibase 的第一个版本称为 Spiner，于 1999 年发布。它是一个企业级、内存、混合、高性能 RDBMS。它由 Altibase 公司制造。它支持完整的 SQL 标准、功能和多版本并发控制 (MVCC)，还实现了模糊和乒乓检查点。阿里云PolarDB与Altibase的区别：
| S.NO. | Alibaba Cloud ApsaraDB for PolarDB | ALTIBASE |
|---|---|---|
| 1. | It was developed by Alibaba in August 2013. | It was developed by Altibase in 1999. |
| 2. | It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle. | It is an enterprise grade, high-performance RDBMS. |
| 3. | In Alibaba Cloud ApsaraDB for PolarDB there are hosted server operating systems. | Server operating systems for Altibase are AIX, HP-UX and Linux. |
| 4. | The license of Alibaba Cloud ApsaraDB for PolarDB is commercial. | The license of Altibase is a open-source. |
| 5. | It supports XML Format. | It does not support XML Format. |
| 6. | It support the Server-side scripting | It stored procedures and stored functions. |
| 7. | Supported partitioning method is Sharding. | It supports stored procedures and stored functions. |
| 8. | It supports SQL query language. | It uses ANSI SQL-92 as a query language. |
| 9. | It supports replication methods. | It also supports replication methods. |
| 10. | ApsaraDB for PolarDB provides the concept of Referential Integrity. Hence, there are Foreign Keys. | Altibase provides the concept of Referential Integrity. Hence, there are Foreign Keys. |
| 11. | It supports in-memory capabilities. | It does not support in-memory capabilities. |
| 12. | It does not offer any API for user-defined Map/Reduce methods. | It also does not offer any API for user-defined Map/Reduce methods. |
| 13. | It is available as a cloud service. | It is not available as a cloud service. |
| 14. | Programming languages supported are Java and Python. | Programming languages supported are C, C++, Java. |