select a.file#,a.name,a.bytes/1024/1024 CurrentMB,ceil(HWM * a.block_size)/1024/1024 ResizeTo,(a.bytes - HWM * a.block_size)/1024/1024 ReleaseMB,'alter database datafile '''||a.name||''' resize '|| ceil(HWM * a.block_size/1024/1024) || 'M;' ResizeCMD from v$datafile a,(select file_id,max(block_id+blocks-1) HWM from dba_extents group by file_id) b where a.file# = b.file_id(+) and (a.bytes - HWM *block_size)>0 order by 5 原文链接：https://www.f2er.com/oracle/212880.html