1. 亚马逊文档数据库：
它是一个商业许可的数据库，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。它目前在 AWS 的加利福尼亚、俄勒冈、北弗吉尼亚和爱尔兰地区可用。它通过模拟响应来实现 Apache 2.0 开源 MongoDB 3.6 API。
2. 亚马逊简单数据库：
它是亚马逊托管的简单数据库服务，数据存储在亚马逊云中。 Amazon 是一项网络服务，用于实时对结构化数据运行查询。这个数据库是由 Amazon.com 用 Erlang 编写的。它具有以下特点——高可用性和灵活性，很少或没有管理负担。
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. |