关键词：云数据库；设计基础；云模型；虚拟化
摘 要：Relatively low-cost, high-performance NoSQL (Not Only SQL) databases contain somefeatures that are useful when it comes to data scalability: Horizontal scalability, support forweaker consistency models, more flexible schemas and data models, and support for simplelow-level query interfaces. This article explores NoSQL databases, including an overview of thecapabilities and features of NoSQL systems HBase, MongoDB, SimpleDB. It also covers cloudand NoSQL database design basics.