1. 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。
2.阿里云表格存储：
阿里云表格存储是一个全托管的宽列存储，可以实时访问大量半结构化数据。它是一种使用多种数据模型的 NoSQL 数据库服务。 Tablestore由阿里云开发，可以存储海量结构化数据。它用于高效的查询和数据分析。阿里云PolarDB版与阿里云表格存储的区别：
| S.NO. | Alibaba Cloud ApsaraDB for PolarDB | Alibaba Cloud Table Store |
|---|---|---|
| 1. | It was developed by Alibaba in August 2013. | It was developed by Alibaba in 2016. |
| 2. | It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle. | It is a fully managed Wide Column Store for large quantities of semi-structured data with real-time access. |
| 3. | In Alibaba Cloud ApsaraDB for PolarDB there are hosted server operating systems. | In Alibaba Cloud Table Store there are hosted server operating systems. |
| 4. | The license of Alibaba Cloud ApsaraDB for PolarDB is commercial. | The license of Alibaba Cloud Table Store is also commercial. |
| 5. | It supports XML Format. | It does not support XML Format. |
| 6. | It supports the Server-side scripting. | It does not support the Server-side scripting. |
| 7. | There is only one partitioning method – Sharding. | It also support partitioning methods. |
| 8. | It supports SQL query language. | It does not support SQL 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. | Table Store does not provide the concept of Referential Integrity. Hence, no 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 supports ACID properties. | It supports Atomic single-row operations. |
| 14. | Programming languages supported are Java and Python. | Programming languages supported are Java and Python. |