1.甲骨文：
Oracle是一个关系数据库管理系统(RDBMS)。它由Oracle Corporation在1980年开发。它是第一个为网格计算而设计的数据库，它提供了最灵活，最具成本效益的方式来管理信息和应用程序。它可以在Windows，Unix，Linux和macOS等主要平台上运行。它是一个关系数据库，用户可以通过该数据库通过应用程序或称为SQL的查询语言来访问数据。
2. MongoDB：
MongoDB是一个跨平台的面向文档的非关系(即NoSQL)数据库程序。它是一个开放源代码文档数据库，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。它使用C++，Go，JavaScript， Python语言编写。 MongoDB提供高速，高可用性和高可伸缩性。一旦安装了MongoDB，用户也可以使用Mongo Shell。 Mongo Shell提供了一个JavaScript界面，用户可以通过该界面进行交互并执行CRUD操作。 Oracle和MongoDB之间的区别：
| 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. |