相关数据存放在一起，针对性的查询可以消除join，性能比分散存储要高且方便
MongoDB中级---->关联多表查询
[日期：2011-08-19] 来源：Linux社区 作者：crazyjixiang [字体：]
DBRef is a more formal specification for creating references between documents. DBRefs (generally) include a collection name as well as an object id. Most developers only use DBRefs if the collection can change from one document to the next. If your referenced collection will always be the same, the manual references outlined above are more efficient.
相关数据存放在一起，针对性的查询可以消除join，性能比分散存储要高且方便
MongoDB之DBref(关联插入,查询,删除) 实例深入
MongoDB 1000W级数据 Insert和Query和Delete性能测试
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