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nyadb2's Issues

dm模块的page缓存我觉得可以考虑去除,保留dataItem缓存 

    因为经常访问的dataItem可能在40个page中都有分步,假如均匀分步在40个page中,那么按照你page缓存的写法,引用计数法,每个page的引用数都会维持>=1,
    如果你在cache里缓存数没有限制,那么你就会在内存中维持40个page,
    如果在cache里有限制,那么除了最初的几个对dataItem的操作外,后面的其他对dataIem的操作都会抛CachEerror错误.
   所以我觉得page缓存会拖累整个数据库的性能.

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