The database server manages the allocation and de-allocation of memory in this portion.

数据库服务器在虚拟区中管理内存的分配和解除分配。

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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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SDO handles all its memory allocation and de-allocation internally, and does not require user code to be involved.

SDO 采用内部方式处理其所有内存分配和释放工作，并不要求使用用户代码。

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