1.亚马逊海王星：
Amazon Neptune 是 Amazon.com 为云产品构建的快速、可靠的图形数据库。它是亚马逊网络服务 (AWS) 的一部分。它于 2017 年 11 月 29 日宣布。它同时支持开源 Apache TinkerPop Gremlin 图遍历语言。它允许用户使用通过 AWS Key Management Service 创建的密钥加密数据库。
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 Neptune 和 Amazon SimpleDB 之间的区别：
| S.NO. | Amazon Neptune | Amazon SimpleDB |
|---|---|---|
| 1. | Developed By Amazon in 2017. | Developed By Amazon in 2007. |
| 2. | It is a fast, reliable graph database built for the cloud product by Amazon.com | It is a hosted simple database service by Amazon, with the data stored in the Amazon Cloud. |
| 3. | It supports the ACID property. | It does not support the ACID property. |
| 4. | It provides the concept of Referential Integrity. Hence, there are Foreign Keys. | It does not provide the concept of Referential Integrity. Hence, no Foreign Keys. |
| 5. | Its Primary database model is Graph DBMS and RDF store. | Its primary database model is the Key-value store. |
| 6. | Immediate Consistency is used to ensure consistency in a distributed system. | Eventual Consistency and Immediate Consistency is used to ensure consistency in a distributed system. |
| 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 multi-availability zones high availability. | It supports replication methods. |
| 9. | It supports predefined data types such as float or date. | It does not support predefined data types such as float or date. |
| 10. | It supports secondary indexes. | It does not support secondary indexes. |