Need some help: Table Space Free Space

From: Viraj Luthra <viraj999_at_lycos.com>
Date: Tue, 11 Sep 2001 22:07:25 -0700
Message-ID: <F001.0038AE84.20010911221031@fatcity.com>

Hello all,

I have an interesting problem on hand. I am using the following query to determine the free space in table space and corressponding data files:-

SELECT d.tablespace_name,d.file_name,

        SUM(d.bytes)/1048576,
        free_space/1048576,
        extent_cnt, 
        free_space/sum(d.bytes)*100,
        count(*)
FROM dba_tablespaces t,
     dba_data_files d,
     (SELECT  tablespace_name  f_tablespace_name,
      SUM(bytes)       free_space,
      count(*)         extent_cnt
      FROM dba_free_space
      GROUP BY tablespace_name )

WHERE t.tablespace_name = d.tablespace_name AND f_tablespace_name(+) = t.tablespace_name GROUP BY d.tablespace_name, d.file_name, free_space, extent_cnt /

Running the above query gives me :-

TbsName Datafile FreeSpace Extents TotalSpace %FreeSpac

TEMP   temp01.dbf   318.82     1275     313.83    101.59
RBS    rbs01.dbf    134.74     388      543.35    24.79
TEMP   temp02.dbf   318.82     1275     5.00      6376.56
USERS  users01.dbf  ****       ****     274.31    ****
SYSTEM system01.dbf 37.74      19       175.00    21.56

Now my questions that I confused are :-

How come it is showing for TEMP tablespace, the Free space is more than the total space( for temp01.dbf free space is 318.92 MB and total space is 313.82 MB)? This is illogical.
The %Free space for both the TEMP tablespace is showing as 101.59% and 6376.56%. How is this possible?
It is not that the query is wrong is it? If so please tell me where? But for eg for SYSTEM and RBS tablespace, it is showing correctly.
For USERS tablespace, it does not show any data for freespace or for extents or for the %free space, makes me wonder what is going on here?

Can you please explain the above phenomena is happening?

Thanks a ton.

rgds,

raja

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Author: Viraj Luthra
INET: viraj999_at_lycos.com

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