1. 关系数据库：
RDBMS 代表关系数据库管理系统。它是最受欢迎的数据库。其中数据以行的形式存储，即元组的形式。它包含许多表，数据可以轻松访问，因为数据存储在表中。该模型由 EF 提出
2. 沙发床：
Couchbase Server 是一个开源、分布式、多模型 NoSQL 面向文档的数据库软件包，针对交互式应用程序进行了优化。它也被称为 Membase。它由 Couchbase, Inc. 开发，最初于 2010 年 8 月发布。
RDBMS 和 Couchbase 的区别：
| S.No. | RDBMS | Couchbase |
|---|---|---|
| 1. | RDBMS is a relational database. | It is a non-relational and document-oriented database. |
| 2. | RDBMS is column-based. | Couchbase is field-based. |
| 3. | It has a predefined schema. | It has a dynamic schema. |
| 4. | It is slower in comparison with Couchbase. | Couchbase is faster than RDBMS. |
| 5. | It supports SQL query language only. | It supports JSON query language. |
| 6. | RDBMS does not provide JavaScript client for querying. | It provides a JavaScript client for querying. |
| 7. | RDBMS is not suitable for hierarchical data storage. | Couchbase is suitable for hierarchical data storage. |
| 8. | It centers around ACID properties. | It also centers around ACID properties. |
| 9. | RDBMS is vertically scalable. | Couchbase is horizontally scalable. |
| 10. | It supports complex joins. | It doesn’t support for complex joins. |