select a.tablespace_name, round(a.total_size) "total_size(MB)",
round(a.total_size)-round(b.free_size,3) "used_size(MB)",
round(b.free_size,3) "free_size(MB)", round(b.free_size/total_size*100,2)||'%' free_rate
from ( select tablespace_name, sum(bytes)/1024/1024 total_size
from dba_data_files
group by tablespace_name ) a,
( select tablespace_name, sum(bytes)/1024/1024 free_size
from dba_free_space
group by tablespace_name ) b
where a.tablespace_name = b.tablespace_name(+);
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