供给状况的后备存储（Backing Storing）机制将低频率使用的年夜对象年夜SessionState中移到响应的后备存储（好交锋件、数据库）中，年夜而缓解处事端内存压力；
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后备存储器通常是一个高速磁盘。
它们可以是一些纯粹的内存对象，只要不用于后备存储。
They can also be purely in-memory objects with no backing store.
正如除磁盘外存在多种后备存储一样，除文件流之外也存在多种流。
Just as there are several backing stores other than disks, there are several kinds of streams other than file streams.
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