1.亚马逊极光：
它是来自 Amazon Web Services 的完全托管的关系数据库引擎，与 PostgreSQL 和 MySQL 兼容。它比标准 MySQL 数据库快五倍，比标准 PostgreSQL 数据库快三倍。 Aurora 的特点是分布式、容错和自愈存储系统。
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 Aurora 和 Amazon SimpleDB 的区别：
| S.NO. | Amazon Aurora | Amazon SimpleDB |
|---|---|---|
| 1. | Developed By Amazon in 2015. | Developed By Amazon in 2007. |
| 2. | It is a MySQL and PostgreSQL compatible cloud service by Amazon. | 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. | 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. |
| 5. | Its Primary database model is Relational DBMS. | Its primary database model is the Key-value store. |
| 6. | It supports Server-side scripting. | It does not support the Server-side scripting. |
| 7. | The partitioning can be done with horizontal partitioning. | It does not support partitioning methods. |
| 8. | It supports SQL query language. | It does not support the SQL query language. |
| 9. | It supports only one replication method – Master-slave replication. | It supports replication methods. |
| 10. | It provides the concept of Referential Integrity. Hence, no Foreign Keys. | It does not provide the concept of Referential Integrity. Hence, no Foreign Keys. |
| 11. | It supports predefined data types such as float or date. | It does not support predefined data types such as float or date. |