1. 沙发座：
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。
2. PostgreSQL :
PostgreSQL 是一个强大的开源对象关系数据库系统。由于其高稳定性，它以低维护工作提供良好的性能。它是第一个实现多版本并发控制 (MVCC) 功能的 DBMS。
Couchbase 和 PostgreSQL 的区别：
| S.NO. | COUCHBASE | POSTGRESQL |
|---|---|---|
| 1. | Developed by Couchbase, Inc. and initially released on August 2011. | Developed by PostgreSQL Global Development Group on 1989. |
| 2. | It is a JSON-based document store derived from CouchDB with a Memcached-compatible interface. | It is widely used open source RDBMS. |
| 3. | Couchbase is written in C++, Erlang, C and Go languages. | PostgreSQL is written in C languages. |
| 4. | he primary database model for Couchbase is Document Store. | The primary database model for PostgreSQL is Relational DBMS. |
| 5. | It has Key-value store as Secondary database models. | It has Document store as Secondary database models. |
| 6. | Server operating systems for Couchbase are Linux, OS X and Windows. | Server operating systems for PostgreSQL are FreeBSD, HP-UX, Linux, NetBSD, OpenBSD, OS X, Solaris, Unix and Windows. |
| 7. | It has functions and timers in JavaScript for Server-side scripts. | It has user defined functions for Server-side scripts. |
| 8. | In Couchbase, partitioning can be done by Sharding. | In PostgreSQL, partitioning can be done by range, list and hash. |
| 9. | It support two replication methods – Master-master replication and Master-slave replication. | It support only one replication methods – Master-master replication. |
| 10. | It supports in-memory capabilities. | It does not supports in-memory capabilities. |
| 11. | Couchbase does not provides the concept of Referential Integrity. Hence, no Foreign Keys. | PostgreSQL provides the concept of Referential Integrity and have Foreign keys. |
| 12. | Couchbase supports Map Reduce method. | PostgreSQL does not supports Map Reduce method. |