Difference between Amazon Aurora and 4D

1. Amazon Aurora :
It is a fully managed relational database engine from Amazon Web Services that is compatible with PostgreSQL and MySQL. It is up to five times faster than standard MySQL databases and three times faster than standard PostgreSQL databases. The features of Aurora are distributed, fault-tolerant and self-healing storage systems.

2. 4th Dimension (4D) :
The 4th Dimension is a relational database management system and IDE developed by Laurent Ribardière. 4D can run as a server so that multiple clients can manage a single database. 4D was created in 1984 and had a slightly delayed public release for Macintosh in 1987. It is an application development environment with an integrated database management system.

Difference between Amazon Aurora and 4D :

AMAZON AURORA	4D
It is developed by Amazon in 2015.	It is developed By 4D, Inc in 1984.
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.
It supports predefined data types such as float or date.	It does not support predefined data types such as float or date.
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.
It is available as a cloud service.	It is not available as a cloud service.
The partitioning can be done with horizontal partitioning.	There is no Partitioning method.
It supports SQL query language.	It does not support the SQL query language.
It provides the concept of Referential Integrity. Hence, no Foreign Keys.	It does not provide the concept of Referential Integrity. Hence, no Foreign Keys.
APIs and other access methods supported are ODBC, RESTful HTTP API and SOAP web-services.	APIs and other access methods supported are JDBC and ODBC.