Couchbase和PostgreSQL之间的区别

1. Couchbase：
Couchbase Server是一个开放源代码，分布式，多模型，NoSQL，面向文档的数据库软件包，已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是一个功能强大的开源对象关系数据库系统。它具有较高的稳定性，因此可以在较低的维护工作量下提供良好的性能。这是第一个实现多版本并发控制(MVCC)功能的DBMS。

Couchbase和PostgreSQL之间的区别：

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.