1. Neo4j ：
Neo4j 是最著名的图形数据库管理系统，它也是 Neo4j, Inc. 开发的 NoSQL 数据库系统。 Neo4j 与 Mysql 或 MongoDB 不同，因为它具有与其他数据库管理系统相比的特殊功能。 Neo4j 以图表的形式存储和呈现数据，而不是表格格式或 Jason 格式。在这里，整个数据由节点表示，在那里您可以创建节点之间的关系，这意味着整个数据库集合将看起来像一个图形，这使其与其他数据库管理系统不同。
2. IBM DB2：
IBM DB2 是 IBM 的关系数据库管理系统 (RDBMS) 产品。它可以有效地分析、存储和检索数据。 DB2 产品增加了对面向对象特性和 XML 非关系结构的支持。
Neo4j 和 IBM DB2 的区别：
| S.NO. | Neo4j | IBM DB2 |
|---|---|---|
| 1. | It was developed by Neo4j, Inc. | It was developed by IBM. |
| 2. | It was initially released in 2007. | It was initially released in 1983. |
| 3. | It is written using Java and Scala language. | It is written using C and C++ languages. |
| 4. | Its server operating systems are Linux, OS X, Solaris, and Windows. | Its server operating systems are AIX, HP-UX, Linux, Solaris, Windows, z/OS. |
| 5. | Its license is open source. | Its licence is commercial. |
| 6. | 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 ADO.NET, JDBC, JSON style queries, ODBC and XQuery. |
| 7. | Neo4j is data schema free and schema optional. | In IBM DB2 the data schema is Fixed. |
| 8. | It does not support SQL. | It supports SQL. |
| 9. | Its primary database model is is Graph DBMS. | Its primary database model is is Relational DBMS. |
| 10. | It supports .Net, Clojure, Elixir, Go, Groovy, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby, Scala programming languages. | It supports C, C#, C++, Cobol, Delphi, Fortran, Java, Perl, PHP, Python, Ruby, Visual Basic programming languages. |
| 11. | It does not supports Partitioning methods. | It supports Sharding Partitioning methods. |
| 12. | Famous companies like medium.com., Stack, Fiverr, Fundamentei, Trendyol Group, double slash, ingsmen Software, GAPO, etc uses Neo4j. | Famous companies like Wells Fargo, Citi, JPMorgan Chase, Bank of America, etc uses IBM DB2. |