1. 玛丽亚数据库：
MariaDB 是一种开源关系数据库管理系统 (RDBMS)，是广泛使用的 MySQL 数据库技术的兼容替代品。它由 MariaDB Foundation 开发并于 2009 年 10 月 29 日首次发布。MariaDB 具有大量新功能，这使其在性能和用户导向方面优于 MySQL。
2.IBM Db2：
IBM Db2 是由 IBM 开发的一系列数据管理产品，包括数据库服务器。它是一个关系数据库管理系统 (RDBMS)，支持面向对象的特性和非关系结构的 XML。 Db2 旨在高效地存储、分析和检索数据。它最初于 1983 年发布，使用 C、C++、 Java和汇编语言编写。
MariaDB 和 IBM Db2 之间的区别：
| SR.NO | MariaDB | IBM Db2 |
|---|---|---|
| 1. | It was developed by MariaDB Corporation Ab. in 2009 | It was developed by IBM in 1983. |
| 2. | It is written in C, C++, Perl and Bash languages. | It is written in C, C++, Assembly language, Java languages. |
| 3. | The primary database model for MariaDB is Relational DBMS. | The primary database model for Db2 is also Relational DBMS. |
| 4. | Server operating systems for MariaDB are FreeBSD, Linux, Solaris and Windows. | Server operating systems for Db2 are AIX, HP-UX, Linux, Solaris, Windows and z/OS. |
| 5. | It provides the concept of Referential Integrity and has Foreign keys. | It also provides the concept of Referential Integrity and has Foreign keys. |
| 6. | It provides ACID transactions without snapshot isolation. | It also provides ACID transactions. |
| 7. | Some companies like CUNY, Accenture, Docplanner, Nasdaq, Red Hat, ServiceNow, etc use MariaDB. | Some companies like JPMorgan Chase, Bank of America, Scotiabank, Citi, etc use Db2. |
| 8. | It has dynamic columns data schema. | It has a fixed data schema. |