因为我们使用Hibernate作为我们的提供者，我们不能选择非关系型数据库，比如Google App Engine。
Because we are using Hibernate as our provider, we cannot choose a non-relational database like Google App Engine.
可以用来存储字符串，哈希结构，链表，集合，因此，常用来提供数据结构服务。 通常也叫做结构化非关系型数据库。
It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets, sorted sets, bitmaps and hyperloglogs.
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