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有所不同，因为它的功能使其与其他数据库管理系统相比显得特别。 Neo4j以图表形式存储和显示数据，而不是以表格格式或以Jason格式显示。在这里，整个数据由节点表示，您可以在节点之间创建关系，这意味着整个数据库集合将看起来像一个图形，这使其在其他数据库管理系统中独树一帜。
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。通过使用XML的面向对象功能和非关系结构的支持，增加了DB2产品。
Neo4j和IBM DB2之间的区别：
| 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. |