NoSQL，泛指非关系型的数据库。随着互联网web2.0网站的兴起，传统的关系数据库在应付web2.0网站，特别是超大规模和高并发的SNS类型的web2.0纯动态网站已经显得力不从心，暴露了很多难以克服的问题，而非关系型的数据库则由于其本身的特点得到了非常迅速的发展。NoSQL数据库的产生就是为了解决大规模数据集合多重数据种类带来的挑战，尤其是大数据应用难题。(NoSQL, generally referred to as a non relational database. With the rise of the Internet Web2.0 website, the traditional relational database in Web2.0 website, especially the large scale and dynamic website Web2.0 pure SNS type high concurrency has appeared to be inadequate, exposed a lot of problems difficult to solve, and non relational database from the characteristics of its own has been very rapid development. NoSQL database generation is to solve the challenges of large data sets of multiple data types, especially big data application problems)