Introduction to redis learning and the four major classifications of NoSQL databases

Recommended (free): redis

KV key-value pair

Sina: BerkeleyDB Redis
Meituan: Redis tair
Alibaba, Baidu: memcache Redis

Document database (more bson format)

CouchDB
MongoDB is equivalent to Mysql
MongoDB is a database based on distributed file storage. Written in C language. Designed to provide scalable, high-performance data storage solutions for WEB applications.
MongoDB is a product between a relational database and a non-relational database. It is the most feature-rich among non-relational databases and is most like a relational database.

Column storage database

Cassandra, HBase
Distributed file system

Graph relational database

It is not for graphics, but for relationships, such as: friend circle social network, advertising recommendation system
Social network, recommendation system. Focus on building relationship graphs
Neo4j, InfoGrid

Four comparisons

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