Oracle performance is slower because of unwanted preallocated tables.

Oracle 性能相对较低，因为存在不必要的预先分配的表。

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As an added complication, we preallocated our virtual disk files, which made transferring the files across a network problematic because of the large file size (8 GB).

另一个额外的问题是，我们预先分配了虚拟磁盘文件，这使通过网络传输文件出现问题，因为文件太大了（8 GB）。

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