虽然你的个人电脑只能保存一个文件的一个副本，但像 Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。

While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.

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为了保存每个惟一实例，需要管理一个附加属性文件。

In order to accommodate each unique instance, you need to manage an additional properties file.

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每一个实例具有一个数据库管理配置文件。

Each instance has one database manager configuration file.

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