什么是NoSQL？ [英] What exactly is NoSQL?

问题描述

NoSQL是什么？是数据库系统只使用{key：value}对？

据我所知 MemCache

还有什么其他流行的NoSQL数据库，它们在哪里有用？

$ b $

blockquote>

NoSQL是一个宽松定义的非关系数据存储类的总称，它具有关系数据库和ACID保证的悠久历史。属于该术语的数据存储可能不需要固定表模式，并且通常避免连接操作。

这种架构的动机是高度可扩展性，支持Facebook，广告.com，etc ...

What exactly is NoSQL? Is it database systems that only work with {key:value} pairs?

As far as I know MemCache is one of such database systems, am I right?

What other popular NoSQL databases are there and where exactly are they useful?

Thanks, Boda Cydo.

解决方案

From wikipedia:

NoSQL is an umbrella term for a loosely defined class of non-relational data stores that break with a long history of relational databases and ACID guarantees. Data stores that fall under this term may not require fixed table schemas, and usually avoid join operations. The term was first popularised in early 2009.

The motivation for such an architecture was high scalability, to support sites such as Facebook, advertising.com, etc...

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