1. PostgreSQL 云分析数据库：
AnalyticDB是阿里云上的在线分析处理数据库系统。它提供 PostgreSQL 和 MySQL 版本。 AnalyticDB for PostgreSQL 是基于 Greenplum 开源数据库程序的在线 MPP(大规模并行处理)数据仓库服务，并通过阿里云进行了一些深度扩展。
2.快板图：
AllegroGraph 是一个高性能、持久的 RDF 存储，额外支持 Graph DBMS。它作为文档存储运行，旨在以 JSON-LD 格式存储、检索和管理面向文档的信息。 AllegroGraph 的第一个版本于 2004 年发布。阿里云 AnalyticDB for PostgreSQL 和 AllegroGraph 的区别：
| S.NO. | Alibaba Cloud AnalyticDB for PostgreSQL | ALLEGROGRAPH |
|---|---|---|
| 1. | It was developed By Alibaba, Pivotal Software Inc. and PostgreSQL Global Development Group in 2016. | It was developed By Franz Inc. in 2004. |
| 2. | It is an online MPP (Massively Parallel Processing) data warehousing service based on Greenplum. | It is a high performance, persistent RDF store with additional support for Graph DBMS. |
| 3. | In Alibaba Cloud AnalyticDB for PostgreSQL there are hosted server operating systems. | Server operating systems for AllegroGraph are linux, OS X and Windows. |
| 4. | The license of Alibaba Cloud AnalyticDB for PostgreSQL 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 supports the Server-side scripting with JavaScript or Common Lisp. |
| 7. | It supports partitioning methods. | The partitioning can be done with Federation. |
| 8. | It supports SQL query language. | It supports SPARQL as query language. |
| 9. | It supports replication methods. | It support two replication methods : Master-Slave Replication and Multi-Master Replication. |
| 10. | AnalyticDB for PostgreSQL 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 does not support in-memory capabilities. | It also 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 C, Java, Perl, Python and R. | Programming languages supported are C#, Clojure, Java, Lisp, Perl, Python, Ruby and Scala. |