This script list all tablespaces (including temporary), gives the number of allocated Mo, Free Mo, Used Mo, free percentage, used percentage and maxsize of the tablespace.

Tablespace usage script

SELECT a.tablespace_name,
       ROUND (a.bytes_alloc / 1024 / 1024) megs_alloc,
       ROUND (NVL (b.bytes_free, 0) / 1024 / 1024) megs_free,
       ROUND ( (a.bytes_alloc - NVL (b.bytes_free, 0)) / 1024 / 1024)
          megs_used,
       ROUND ( (NVL (b.bytes_free, 0) / a.bytes_alloc) * 100) Pct_Free,
       100 - ROUND ( (NVL (b.bytes_free, 0) / a.bytes_alloc) * 100) Pct_used,
       ROUND (maxbytes / 1048576) MAX
  FROM (  SELECT f.tablespace_name,
                 SUM (f.bytes) bytes_alloc,
                 SUM (
                    DECODE (f.autoextensible,
                            'YES', f.maxbytes,
                            'NO', f.bytes))
                    maxbytes
            FROM dba_data_files f
        GROUP BY tablespace_name) a,
       (  SELECT f.tablespace_name, SUM (f.bytes) bytes_free
            FROM dba_free_space f
        GROUP BY tablespace_name) b
 WHERE a.tablespace_name = b.tablespace_name(+)
UNION ALL
  SELECT h.tablespace_name,
         ROUND (SUM (h.bytes_free + h.bytes_used) / 1048576) megs_alloc,
         ROUND (
            SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0))
            / 1048576)
            megs_free,
         ROUND (SUM (NVL (p.bytes_used, 0)) / 1048576) megs_used,
         ROUND (
            (SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0))
             / SUM (h.bytes_used + h.bytes_free))
            * 100)
            Pct_Free,
         100
         - ROUND (
              (SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0))
               / SUM (h.bytes_used + h.bytes_free))
              * 100)
            pct_used,
         ROUND (SUM (f.maxbytes) / 1048576) MAX
    FROM sys.v_$TEMP_SPACE_HEADER h,
         sys.v_$Temp_extent_pool p,
         dba_temp_files f
   WHERE     p.file_id(+) = h.file_id
         AND p.tablespace_name(+) = h.tablespace_name
         AND f.file_id = h.file_id
         AND f.tablespace_name = h.tablespace_name
GROUP BY h.tablespace_name
ORDER BY 1;