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how to reclaim disk space after deleting undo tablespace [message #249313]

Wed, 04 July 2007 01:22

mskalova
Messages: 4
Registered: May 2007
Location: Australia

Junior Member

Hi,
the platform we are using is linux ENT 4, with oracle 10.2.3

the problem we are having is that when we dropped an undo tablespace with deleting the system datafile, it doesnt release the disk space back to the OS. the file is actually deleted. but if you do a lsof at the os level the file is actually marked deleted. but the diskpace is still being used.

i know that by shutting down the instance it will free up the disk space but I dont have to shut the instance down.

the database currently is using another tablespace. we dropped the old tablespace because it got too large and a user didnt do commit when running some queries.

has anyone come across this issue before.
thanks
M

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Re: how to reclaim disk space after deleting undo tablespace [message #249315 is a reply to message #249313]

Wed, 04 July 2007 01:34

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

>i know that by shutting down the instance it will free up the disk space but I dont have to shut the instance down.
You do if the OS is to reclaim the dsk space.

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Re: how to reclaim disk space after deleting undo tablespace [message #249321 is a reply to message #249315]

Wed, 04 July 2007 01:40

mskalova
Messages: 4
Registered: May 2007
Location: Australia

Junior Member

thanks for the reply, its not really for OS to reclaim. I would like to put an export file on the drive but with the deleted being locked by oracle I cant do that as 32G of disk space is wasted.
anyother way to free deleted file... why doesnt oracle release the deleted file after you have drop the tablespace and its datafile?

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Re: how to reclaim disk space after deleting undo tablespace [message #249323 is a reply to message #249321]

Wed, 04 July 2007 01:43

Michel Cadot
Messages: 68737
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Quote:

why doesnt oracle release the deleted file after you have drop the tablespace and its datafile?

This question is irrelevant.
It is as it is, you have to do with it.

Regards
Michel

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Re: how to reclaim disk space after deleting undo tablespace [message #249601 is a reply to message #249313]

Thu, 05 July 2007 02:42

kartikshingala
Messages: 1
Registered: July 2007
Location: Pune

Junior Member

Does this tablespace so in your v$tablespace?

did you try rm -r for deleting this datafile.

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Re: how to reclaim disk space after deleting undo tablespace [message #249602 is a reply to message #249601]

Thu, 05 July 2007 02:46

Michel Cadot
Messages: 68737
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

He said the datafile ARE deleted just the space does not return the file system.
The reason is that there still is at least one opened handle on it.

Regards
Michel

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Re: how to reclaim disk space after deleting undo tablespace [message #249782 is a reply to message #249602]

Thu, 05 July 2007 20:33

mskalova
Messages: 4
Registered: May 2007
Location: Australia

Junior Member

i think this must be a bug. have you guys tried it.

do a lsof |grep filename after you have deleted the undotablespace you will see that oracle will not release this file even thought the system has marked it for delete...

regards
M

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Re: how to reclaim disk space after deleting undo tablespace [message #249785 is a reply to message #249313]

Thu, 05 July 2007 20:56

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

>i think this must be a bug.
It is NORMAL *nix action & NOT a bug and has nothing to do with Oracle.

The "rm" command simply eliminates the inode from the parent directory; BUT the inode is still in use so disk blocks do NOT get released back to the file system until the file is closed.

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