因此，这种模式的大多数部署都是将数据移动到关系型目标数据库。
Therefore, most deployments of this pattern move data to a relational target database.
比如数据库连接池就是单例设计模式的一个例子：我们一般不想让应用程序具有连接池类的多个资源密集型实例。
An example use case for a singleton would be a database connection pool: you don't want your application to have multiple resource-intensive instances of a connection pool class.
一个纯关系型的数据库模式将需要数百个表来表示PDBML。
A fully relational database schema would require hundreds of tables to represent PDBML.
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