select a.file_name,a.bytes/1024/1024 TOTAL,b.sb/1024/1024 FREE,100*b.sb/a.bytes "FREE%"
from dba_data_files a,(select file_id,sum(BYTES) sb from dba_free_space group by file_id) b
where a.file_id=b.file_id order by a.file_name;
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