Difference between Alibaba Cloud ApsaraDB for PolarDB and AllegroGraph

1. Alibaba Cloud ApsaraDB for PolarDB :
It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle. ApsaraDB architecture supported 5000 physical machines in a single cluster. It is designed for business-critical database applications that require fast performance, high concurrency, and automatic scaling.

2. AllegroGraph :
It is a high performance, persistent RDF store with additional support for Graph DBMS. It operates as a Document Store designed for storing, retrieving and managing document-oriented information, in JSON-LD format. The first version of AllegroGraph was released in 2004.


Difference between Alibaba Cloud ApsaraDB for PolarDB and AllegroGraph :

S.NO.	Alibaba Cloud ApsaraDB for PolarDB	ALLEGROGRAPH
1.	It was developed by Alibaba in August 2013.	It was developed by Franz Inc. in 2004.
2.	It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle.	It is a high performance, persistent RDF store with additional support for Graph DBMS.
3.	In Alibaba Cloud ApsaraDB for PolarDB there are hosted server operating systems.	Server operating systems for AllegroGraph are Linux, OS X and Windows.
4.	The license of Alibaba Cloud ApsaraDB for PolarDB is commercial.	The license of AllegroGraph is also commercial.
5.	It supports XML Format.	It does not support XML Format.
6.	It supports the Server-side scripting	It support the Server-side scripting with JavaScript or Common Lisp.
7.	There is only one partitioning method – Sharding.	The partitioning can be done with Federation.
8.	It supports SQL query language.	It uses SPARQL as query language.
9.	It supports replication methods.	It support two replication methods : Master-Slave Replication and Multi-Master Replication.
10.	ApsaraDB for PolarDB provides the concept of Referential Integrity. Hence, there are Foreign Keys.	AllegroGraph does not provide the concept of Referential Integrity. Hence, no Foreign Keys.
11.	It supports in-memory capabilities.	It does not support in-memory capabilities.
12.	It does not offer any API for user-defined Map/Reduce methods.	It also does not offer any API for user-defined Map/Reduce methods.
13.	It is available as a cloud service.	It is not available as a cloud service.
14.	Programming languages supported are Java and Python.	Programming languages supported are C#, Clojure, Java, Lisp, Perl, Python, Ruby and Scala.