Tablespace usage

--set pages 999
--col tablespace_name format a40
--col "size MB" format 999,999,999
--col "free MB" format 99,999,999
--col "% Used" format 999
select    tsu.tablespace_name, ceil(tsu.used_mb) "size MB"
,               decode(ceil(tsf.free_mb), NULL,0,ceil(tsf.free_mb)) "free MB"
,               decode(100 - ceil(tsf.free_mb/tsu.used_mb*100), NULL, 100,
               100 - ceil(tsf.free_mb/tsu.used_mb*100)) "% used"
from      (select tablespace_name, sum(bytes)/1024/1024 used_mb
                from      dba_data_files group by tablespace_name union all
                select    tablespace_name || '  **TEMP**'
                ,               sum(bytes)/1024/1024 used_mb
                from      dba_temp_files group by tablespace_name) tsu
,               (select tablespace_name, sum(bytes)/1024/1024 free_mb
                from      dba_free_space group by tablespace_name) tsf
where   tsu.tablespace_name = tsf.tablespace_name (+)
order     by 4

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