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 * a.block_size) >0
and rownum < 10;
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oracle