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select
b.file_name FILESNAME,
b.tablespace_name TABLESPACES,
b.bytes/1024/1024 SIZEM,
(b.bytes-sum(nvl(a.bytes,0)))/1024/1024 USEDM,
substr((b.bytes-sum(nvl(a.bytes,0)))/(b.bytes/100),1,5) USEDBY
from dba_free_space a,dba_data_files b
where a.file_id=b.file_id
group by b.tablespace_name,b.file_name,b.bytes
order by b.tablespace_name;
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