They are "sparse" ie the space is not allocated until
required.  On some OS's you can workaround it by
copying the file elsewhere and then copying it back.

hth
connor

 --- Guang Mei <[EMAIL PROTECTED]> wrote: > Oracle
8173 on Solaris 2.8:
> 
> bash-2.03$ pwd
> /oracle/u02/oradata/YPD
> 
> bash-2.03$ df -k|grep /oracle/u02
> /dev/dsk/c1t2d0s0    70592505 45549803 22924927   
> 67%    /oracle/u02
> 
> bash-2.03$ ls -l templmt*
> -rw-r-----   1 oracle   oinstall 2097160192 Dec 19
> 20:40 templmt01.dbf
> -rw-r-----   1 oracle   oinstall 2097160192 Dec 19
> 20:27 templmt02.dbf
> -rw-r-----   1 oracle   oinstall 2097160192 Dec 19
> 20:27 templmt03.dbf
> -rw-r-----   1 oracle   oinstall 2097160192 Dec 19
> 20:27 templmt04.dbf
> -rw-r-----   1 oracle   oinstall 2097160192 Dec 19
> 20:27 templmt05.dbf
> 
> bash-2.03$ rm templmt*
> 
> bash-2.03$ df -k|grep /oracle/u02
> /dev/dsk/c1t2d0s0    70592505 44244651 24230079   
> 65%    /oracle/u02
> 
> I thought I should get 10GB (2097160192 x 5) back,
> but instead I got only 
> 1.3MB  ( 24230079 - 22924927)  released. Could
> someone explain? BTW, when I 
> created the temp files (templmt0[1-5]) for
> locally-managed temp tablespace, 
> I found they were created extremely fast, so I
> suspected that not real disk 
> space were allocated. But the "ls -l" command still
> showed 10GB were 
> allocated.
> 
> TIA.
> 
> Guang Mei
> 
> [EMAIL PROTECTED]
> http://www.geocities.com/guangmei/
> 
> 
> 
> 
> 
> 
> 
>
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=====
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