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Amazon Web Services(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图形遍历语言。它允许用户使用通过AWS Key Management Service创建的密钥来加密数据库。
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 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. |