Data files free space calculation

Question

Hi,
I have a query that calculates the Max Size (MB), Allocated (MB), Used (MB) and Used (%) for each data file in a 10.2 database.
The results from this query are similar to what I see in dbconsole or EMconsole except for the undo datafile, my script says +- 50% used,
dbconsole says 97% used and EM console says 0% used... does anyone have an idea what might be the cause of this?
SELECT ddf.file_id "File#",
ddf.file_name "Name",
(ddf.maxbytes/1024/1024) "Max Size (MB)",
(ddf.bytes/1024/1024) "Allocated (MB)",
((ddf.bytes) - NVL(SUM(dfs.bytes), 0))/1024/1024 "Used (MB)",
((((ddf.bytes) - NVL(SUM(dfs.bytes), 0))/ddf.bytes)*100) "Used (%)",
ddf.autoextensible "AutoExt.",
((ddf.bytes/ddf.blocks)*ddf.increment_by)/1024/1024 "Increment By (MB)"
FROM
dba_data_files ddf, dba_free_space dfs
WHERE
ddf.file_id = dfs.file_id(+)
GROUP BY ddf.file_id, ddf.file_name, ddf.maxbytes, ddf.bytes, ddf.autoextensible, ddf.increment_by, ddf.blocks
ORDER BY ddf.file_id;
I also try to calculate the same numbers for the temp datafile, I know that there is dba_temp_files and v$tempfile,
but how do I calculate the used space in the temp file ?
Thanks!
Pieter

Answer 1

Hi,
i used following query to see the free in space in tablespace,u can also try with it.
SELECT a.tablespace_name TSNAME, SUM(a.tots)/1048576 Tot_Size,
SUM(a.sumb)/1048576 Tot_Free,
SUM(a.sumb)*100/sum(a.tots) Pct_Free,
SUM(a.largest)/1048576 Large_Ext, SUM(a.chunks) Fragments
FROM (SELECt tablespace_name, 0 tots, SUM(bytes) sumb,
MAX(bytes) largest, COUNT(*) chunks
FROM dba_free_space a
GROUP BY tablespace_name
UNION
SELECT tablespace_name, SUM(bytes) tots, 0, 0, 0
     FROM dba_data_files
GROUP BY tablespace_name) a
GROUP BY a.tablespace_name
for free/used space in temp tablespace
SELECT tablespace_name, SUM(bytes_used)/1024/1024 "Tot Used Space in MB", SUM(bytes_free)/1024/1024 "Tot Free Space in MB"
FROM V$temp_space_header
GROUP BY tablespace_name;
Thanks
Kuljeet