Details of each subscription registration and de-registration is stored in the broker database table.

每个订阅注册和重新注册的详细信息存储在代理数据库表中。

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To take advantage of data store, it is often advised to de-normalize your data, allowing for related data to be stored together and retrieved together.

为了充分利用数据存储，我们通常建议对数据进行反常规处理，比如允许相关数据存储在一起并被一起检索。

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There are some callbacks for variable system events such as memory warnings and the de-allocation.

代码中有一些对可变的系统事件（比如说内存警告和存储单元分配）的回调。

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