KV key-value pair
Sina: BerkeleyDB + Redis
Meituan: Redis + tair
Ali, Baidu: memcache + Redis
Document database (bson format is more)
CouchDB
MongoDB is equivalent to Mysql++
MongoDB is a database based on distributed file storage. Written by C++ language. Designed to provide scalable high-performance data storage solutions for WEB applications .
MongoDB is a product between relational and non -relational databases. It is the most versatile and most like relational database among non-relational databases.
Column store database
Cassandra, HBase
distributed file system
Graph relational database
It is not graphics, but relationships, such as: Moments social network, advertising recommendation system,
social network, recommendation system. Focus on building relationship graph
Neo4j, InfoGrid
Four contrasts
