回縮表空間

--計算datafile能夠resize收縮的空間. col name for a40 col resizecmd for a80app select a.file#,a.name,a.bytes/1024/1024 CurrentMB,        ceil(HWM * a.block_size)/1024/1024 ResizeTo,        (a.bytes - HWM * a.bl

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