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，用户可以通过称为 SQL 的应用程序或查询语言访问其中的数据。
2. 沙发数据库：
CouchDB 是一个开源的面向文档的 NoSQL 数据库，它使用多种格式和协议来存储、传输和处理其数据，它使用 JSON 存储数据，使用 MapReduce 作为其查询语言的 JavaScript，以及用于 API 的 HTTP。它由 Apache 软件基金会开发，最初于 2005 年发布。它是用 Erlang 编写的。 Oracle 和 CouchDB 的区别：
| S.NO. | ORACLE | COUCHDB |
|---|---|---|
| 1. | It was developed by Oracle Corporation in 1980. | It was developed by Apache Software Foundation in 2005. |
| 2. | It is written in C and C++. | It is written in Erlang language. |
| 3. | It is a commercial software. | It is an open-source software. |
| 4. | The primary database model for Oracle is Relational DBMS. | The primary database model for CouchDB is Document Store. |
| 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. | The replication methods that Oracle supports are Master-Slave Replication, Master-Master Replication. | The replication methods that CouchDB supports are also Master-Slave Replication, Master-Master Replication. |
| 7. | Server operating systems for Oracle are Solaris, Linux, OS X, Windows. | Server operating systems for CouchDB are Android, BSD, Linux, OS X, Solaris and Windows. |
| 8. | ACID properties of transaction are used. | It does not provides ACID transactions. |
| 9. | Immediate Consistency method ensures consistency. | Eventual Consistency method ensures consistency in a distributed system. |
| 10. | It provides fine grained access rights according to SQL-standard. | It provides access rights for users can be defined per database. |