1. Neo4j ：
它是最著名的图形数据库管理系统，也是 Neo4j, Inc. 开发的 NoSQL 数据库系统。它不同于 Mysql 或 MongoDB，因为它具有与其他数据库管理系统相比的特殊功能。 Neo4j 还以非表格格式或非 Jason 格式的图形形式存储和呈现数据。在这里，整个数据由节点表示，在那里你可以创建节点之间的关系，这意味着整个数据库集合看起来像一个图形，这使得 Neo4j 与其他数据库管理系统不同。
2. 卡桑德拉：
它是一种开源的分布式数据库管理系统，具有广泛的列存储和 NoSQL 数据库，旨在处理和支持跨多个服务器的大量数据。它为我们提供了无单点故障的高可用性。它最初于 2008 年 7 月发布，由 Apache 软件基金会开发。
Neo4j 和 Cassandra 的区别：
| S.No. | Neo4j | Cassandra |
|---|---|---|
| 1. | It was developed by Neo4j, Inc. | It was developed by Apache Software Foundation. |
| 2. | It was initially released in 2007. | It was initially released on July 2008. |
| 3. | It is written using Java and Scala language. | It iswritten only in Java language. |
| 4. | Neo4j server operating systems are Linux, OS X, Solaris, and Windows. | Its server operating systems are BSD, Linux, OS X, Windows. |
| 5. | It has foreign keys. | It does not have foreign keys. |
| 6. | Neo4j APIs and other access methods includes Bolt protocol, Cypher query language, Java API, Neo4j-OGM, RESTful HTTP, API, Spring Data Neo4j, TinkerPop 3. | APIs and other access methods include Proprietary protocol and Thrift. |
| 7. | It is data schema free and schema optional. | It is data schema free. |
| 8. | It does not support SQL. | It provides support to SQL-like SELECT, DML and DDL statements (CQL). |
| 9. | Its primary database model is is Graph DBMS. | Its primary database model is Wide column store. |
| 10. | Neo4j supports programming languages which are .Net, Clojure, Elixir, Go, Groovy, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby and Scala. | It supports C#, C++, Clojure, Erlang, Go, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby and Scala. |
| 11. | It does not supports Partitioning methods. | It supports Sharding Partitioning methods. |
| 12. | Neo4j is uesd by famous companies like medium.com., Stack, Fiverr, Fundamentei, Trendyol Group, double slash, ingsmen Software, GAPO, etc. | Famous companies like Instagram, Reddit, The Weather Channel, GitHub, etc uses Cassandra. |