Re: "Deallocate Unused" not releasing space above HWM

  • From: Mladen Gogala <mladen@xxxxxxxxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Thu, 11 Mar 2004 17:45:43 -0500

On 03/11/2004 03:32:38 PM, Adam Donahue wrote:
> Is there a case where you can deallocate unused for a table other than 
> when you've manually allocated additional extents?
> 
> Adam

Well, yes, if the initial allocation was far too big, which is really 
a case similar to the one with manually added extents. To be entirely 
truthful, I consider "deallocate extents" command to be of very limited 
use. I studied it for my OCP, but have never had a chance to use it. Alter
table move or DBMS_REDEFINITION are much more useful and DBMS_REDEFINE can
even help you do the simple operations on the columns.
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