Dropping UNDO did not free space at OS level

Hi,
As my UNDO tablespace grew very large, i had to drop it by creating a second UNDO tablespace and switching the database to use it. After i successfully dropped the first UNDO, the file systems, which hosted the datafiles of the first UNDO still shows that they are 100% full. I have checked the alert log and everthing looks perfectly fine with the following message
drop tablespace undotbs1 including contents and datafiles
delted file '/u04/oradata/sunshine/undotbs1.dbf'
deleted file '/u06/oradata/sunshine/undotbs1_1.dbf'
Completed: drop tablespace undotbs1 including contents and datafiles
Even the two datafiles 'undotbs1.dbf' and 'undotbs1_1.dbf' were deleted with the "drop tablespace ........" command itself.
Is it required to bounce the database for the changes to be reflected at the OS level?
Any insight?
THanks,
Harris.

Hi,
My Oracle version is 9.2.0.5 and i am running on Solaris 9. I have created a new UNDO tablespace UNDOTBS2 and dropped the old UNDO tablespace UNDOTBS1. After i issued the "drop tablespace UNDOTBS1 including contents and datafiles" it deleted the physical datafiles at the OS level too. I do not see any datafiles of the first dropped undo tablespace UNDOTBS1 in the directories specified i.e.,
'/u04/oradata/sunshine/undotbs1.dbf'
'/u06/oradata/sunshine/undotbs1_1.dbf'
So, the tablespace along with datafiles has been dropped (at the OS level too) with the "drop tablespace........" command itself. But, the file system still does not show the freed up space. I have altered the system to use the second undo tablespace UNDOTBS2 before dropping the first.
The second undo UNDOTBS2 has auto extend off, so there is no issue of this increasing to this much of size. The first undo tablespace that i dropped was around 15G of size and it has autoextend ON.
Any suggestions?
Thanks,
Harris.

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