1. 甲骨文：
Oracle 是一个关系数据库管理系统 (RDBMS)。它由 Oracle Corporation 于 1980 年开发。它是第一个专为网格计算设计的数据库，可提供最灵活、最具成本效益的信息和应用程序管理方式。它可以在 Windows、Unix、Linux 和 macOS 等主要平台上运行。它是一种关系数据库，用户可以通过应用程序或称为 SQL 的查询语言访问其中的数据。
2. MongoDB：
MongoDB 是一个跨平台的面向文档的非关系型(即 NoSQL)数据库程序。它是一个开源文档数据库，以键值对的形式存储数据。 MongoDB 由 MongoDB Inc. 开发，最初于 2009 年 2 月 11 日发布。它是用 C++、Go、JavaScript、 Python语言编写的。 MongoDB 提供高速、高可用性和高可扩展性。一旦安装了 MongoDB，用户也可以使用 Mongo shell。 Mongo shell 提供了一个 JavaScript 接口，用户可以通过它进行交互和执行 CRUD 操作。 Oracle 和 MongoDB 的区别：
| S.NO. | ORACLE | MONGODB |
|---|---|---|
| 1. | It was developed by Oracle Corporation in 1980. | It was developed by MongoDB Inc. in 2009. |
| 2. | It is written in C and C++. | It is written in C++, Go, JavaScript, Python languages. |
| 3. | It is a commercial software. | It is an open-source software. |
| 4. | Server operating systems for Oracle are Solaris, Linux, OS X, Windows. | Server operating systems for MongoDB are Solaris, Linux, OS X, Windows, AIX, HP-UX. |
| 5. | It uses Horizontal partitioning method for storing different data on different nodes. | It uses Sharding partitioning method for storing different data on different nodes. |
| 6. | Referential integrity is used in Oracle. | No concept of referential integrity and no Foreign keys. |
| 7. | JDBC, ODBC, ODP.NET, OCI are the APIs and access methods used in Oracle. | Proprietary protocol using JSON are the APIs and access methods used in MongoDB. |
| 8. | The replication methods that Oracle supports are Master-Slave Replication and Master-Master Replication. | The replication method that MongoDB supports is Master-Slave Replication. |
| 9. | It provides fine grained access rights according to SQL-standard. | It provides access rights for users and roles . |
| 10. | Immediate Consistency method ensures consistency in Oracle. | Eventual Consistency and Immediate Consistency methods ensures consistency in MongoDB. |