Capped Collection 是一种特殊的集合，它大小固定，当集合的大小达到指定大小时，新数据覆盖老数据。Capped collections可以按照
c.创建集合的时候Max属性是可选的，文档数量限制是在容量没满的时候进行淘汰，要是满了，，就根据容量限制来替换数据。例如上面的例子我们设置文档数量限制是10这样的话在没有达到容量上限的时候，最多只能存储10个文档。
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