select df.tablespace_name
,format_bytes(df.total_space) as total_space
,format_bytes(df.total_space - fs.free_space) as used_space
,format_bytes(fs.free_space) as free_space
from (select tablespace_name, sum(bytes) as total_space
from dba_data_files
group by tablespace_name
) df,
(select tablespace_name, sum(bytes) as free_space
from dba_free_space
group by tablespace_name
) fs
where df.tablespace_name = fs.tablespace_name
order by df.tablespace_name
;
Oracle query table space statistics
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