1. Amazon DocumentDB：
它是一种商业许可的数据库，具有以下功能，因为它是一种支持MongoDB工作负载的快速，可扩展，高度可用和完全托管的文档数据库服务。目前在AWS的加利福尼亚州，俄勒冈州，北弗吉尼亚州和爱尔兰地区可用。它通过模拟响应来实现Apache 2.0开源MongoDB 3.6 API。
2. Amazon SimpleDB：
它是Amazon托管的简单数据库服务，数据存储在Amazon Cloud中。它是Amazon是一项用于实时在结构化数据上运行查询的Web服务。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。
Amazon DocumentDB和Amazon SimpleDB之间的区别：
| S.NO. | Amazon DocumentDB | Amazon SimpleDB |
|---|---|---|
| 1. | It is developed By Amazon in 2019. | It is developed By Amazon in 2007. |
| 2. | It is a fast, scalable, highly available, and fully managed MongoDB-compatible database service. | It is a hosted simple database service by Amazon, with the data stored in the Amazon Cloud. |
| 3. | It supports predefined data types such as float or date. | It does not support predefined data types such as float or date. |
| 4. | Its Primary database model is a Document store. | Its primary database model is the Key-value store. |
| 5. | It does not offers an API for user-defined Map/Reduce methods. But maybe implemented via Amazon Elastic MapReduce (Amazon EMR). | It does not offer an API for user-defined Map/Reduce methods. |
| 6. | It supports Atomic single-document operations. | It does not support the ACID property. |
| 7. | It does not support partitioning methods. | It also does not support partitioning methods. But sharding must be implemented in the application. |
| 8. | It supports SQL query language. | It does not support the SQL query language. |
| 9. | It supports Multi-availability zones for high availability. | It supports replication methods. |
| 10. | The programming languages supported are Go, Java, PHP, JavaScript, and Python. | The programming languages supported are .Net, C, C++, Erlang, Java, PHP, Python, Ruby, and Scala. |