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).
With a preallocated Runnable object and a separate scope, you should always be in a position to report a problem without using any memory in the context the error occurred.