NoSql basic knowledge

The big picture to keep in mind first is:

 

There are lots of articles and resources out there:

http://blog.sina.com.cn/s/blog_3fe961ae010139u6.html

http://old.sebug.net/paper/databases/nosql/Nosql.html

http://blog.csdn.net/godfrey90/article/details/6706184， http://blog.csdn.net/godfrey90/article/details/6754884