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02 Things I don't know about today NoSQL

Source: Internet
Author: User
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==1 nosql==

NoSQL, which refers to non-relational databases.

  • NoSQL databases are created to address the challenges of multiple data types in large-scale data sets, especially big data application challenges.

Four categories of NoSQL databases

1.1 键值(Key-Value)存储数据库这一类数据库主要会使用到一个哈希表，这个表中有一个特定的键和一个指针指向特定的数据.1.2 列存储数据库。这部分数据库通常是用来应对分布式存储的海量数据。键仍然存在，但是它们的特点是指向了多个列。这些列是由列家族来安排的。1.3 文档型数据库该类型的数据模型是版本化的文档，半结构化的文档以特定的格式存储，比如JSON。文档型数据库可 以看作是键值数据库的升级版，允许之间嵌套键值。而且文档型数据库比键值数据库的查询效率更高。如：CouchDB, MongoDb.> MongoDB 是一个基于分布式文件存储的数据库。由C++语言编写。旨在为WEB应用提供可扩展的高性能数据存储解决方案。> MongoDB  是一个介于关系数据库和非关系数据库之间的产品，是非关系数据库当中功能最丰富，最像关系数据库的。1.4 图形(Graph)数据库图形结构的数据库同其他行列以及刚性结构的SQL数据库不同，它是使用灵活的图形模型，并且能够扩展到多个服务器上。

02 Things I don't know about today NoSQL

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