当内存缓存区域满时，lru会首先删除最近最少使用的缓存数据。
When the memory cache region becomes full, LRU removes the least recently used cached data first.
您可能需要删除不需要的年份，以减少缓存在服务器内存中的日期维度的成员数，从而提高系统性能。
You may also want to remove unneeded years in order to decrease the number of date dimension members that are cached in sever memory, thereby improving system performance.
首先，缓存会实现最近最少使用的算法，使得 ASP.NET 能够在内存运行效率较低的情况下强制缓存清除——从缓存自动删除未使用过的项目。
The first is that the Cache implements a least-recently-used algorithm, allowing ASP.NET to force a Cache purge—automatically removing unused items from the Cache—if memory is running low.
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