NoSQL四种——kv存储(memcache,Riak),列存储(Cassandra,Hbase),文档类(mongoDB,CouchDB),图数据库(neo4j)-阿里云开发者社区

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NoSQL四种——kv存储(memcache,Riak),列存储(Cassandra,Hbase),文档类(mongoDB,CouchDB),图数据库(neo4j)

简介:

见:https://software.intel.com/sites/default/files/Configuration_and_Deployment_Guide_for_Cassandra_on_IA.pdf

NoSQL databases can be classified
into four categories: Key-Value Store This is the most basic data model, where the data is stored as key-value pairs.
Columnar Store:Similar to key-value store, data is stored as key-value pairs. However, each entry (referenced by a key) contains one or more key-value pairs instead of a value. A columnar store is essentially a two dimensional array (Tezer, 2014a). Document-Oriented Database The fundamental concept is the document, which is a group of data with internal structure that can be defined arbitrarily. A document is referenced by a key and this allows documents to nest inside one another. Unlike in relational databases, the internal structure of a document does not need to be predefined and can be changed anytime. While this makes storing data with complex or even ever-changing structure much easier, it also poses a challenge for querying as the complexity grows.
Graph Database:This uses graph structures to store data and thus, is most suitable for heavily linked data that can be best represented in graphs。
见:http://edoc.sub.uni-hamburg.de/haw/volltexte/2016/3578/pdf/Thesis.pdf 里面介绍了如何去实现一个高性能的kv数据库,嵌入式的,参考了levelDB和LMDB等。










本文转自张昺华-sky博客园博客,原文链接:http://www.cnblogs.com/bonelee/p/6322489.html,如需转载请自行联系原作者



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