SPACE UTILIZATION OF TEMPORARY FILES

Hi DBAS..
I need to confirm the behaviour of Oracle temporary datafiles asap.
I had tried to increase the temporary files of one of my database temporary
tbsp.
After I had increase the space, it noticed the space utilization had not
changed at all, even though the filesize of the temporay datafile is correct
based on the unix command : ls -l.
Below is a replica of my action:
1) Before Incr of Size of Datafile-
SQL> select file_name, bytes/1024/1024 from dba_temp_files;
FILE_NAME BYTES/1024/1024
/oradata/VEPD/d07/temp_01.dbf 50
/oradata/VEPD/d04/temp_02.dbf 100
SQL> !df -m /oradata/VEPD/d07
Filesystem MB blocks Free %Used Iused %Iused Mounted on
/dev/lvvepd07 2176.00 370.29 83% 11 1% /oradata/VEPD/d07
SQL> !ls -l /oradata/VEPD/d07/temp_01.dbf
-rw-r----- 1 oracle oinstall 52436992 Jan 16 10:28 temp_01.dbf
1) After Incr of Size of Datafile-
SQL> alter database tempfile '/oradata/VEPD/d07/temp_01.dbf' resize 300M;
Database altered.
SQL> !ls -ltr /oradata/VEPD/d07/temp_01.dbf
-rw-r----- 1 oracle oinstall 314580992 Jan 16 11:11
/oradata/VEPD/d07/temp_01.dbf
SQL> !df -m /oradata/VEPD/d07
Filesystem MB blocks Free %Used Iused %Iused Mounted on
/dev/lvvepd07 2176.00 370.29 83% 11 1% /oradata/VEPD/d07
SQL> select file_name, bytes/1024/1024 from dba_temp_files;
FILE_NAME BYTES/1024/1024
/oradata/VEPD/d07/temp_01.dbf 300
/oradata/VEPD/d04/temp_02.dbf 100
The result (aft the incr) for 'ls -l' is expected.
BUT, is the result (aft the incr) for 'df -m' an expected behaviour??
Thanks
JD

Your observation is correct.
Unlike regular datafiles, Oracle will not actually occupy the space reserved for temp datafile until it actually need to use it.

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How Do I Get Rid Of The “Other” Data Stored On My iPad Or iPhone?
http://tinyurl.com/85w6xwn
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Here's what I tried to say in my response that I wasn't authorize to make:
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SPACE UTILIZATION OF TEMPORARY FILES

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