The automatic cache-to-file storage option can result in performance issues because it does not have native support for filtering and sorting.

自动缓存到文件选项可能会造成性能问题，因为它本身不支持筛选和排序。

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The result shows that there exist the features of poor sorting, low shale content and poor physical properties in the reservoirs, which belong to low-porosity and extra-low-permeability reservoirs.

研究结果表明，该区含油气储集层具有分选性差、泥岩含量低、物性差的特征，属于低孔-特低渗型储集层。

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This paper proposes a new external sorting algorithm. The algorithm need not to produce original merged segment in advance and can immediately get the anticipant sorting result.

提出一种新的外分类算法，该算法无须预先产生初始归并段，可以快速获得预定分类结果。

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