Re: "Deallocate Unused" not releasing space above HWM
- From: Mladen Gogala <mgogala@xxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 11 Mar 2004 19:39:26 -0500
create table tbl (
a number )
tablespace test_tbs
storage (initial 10m
next 2048M
pctincrease 0
minextents 15);
On 03/11/2004 07:02:25 PM, Adam Donahue wrote:
> How can one do this, simulate this case? How does one force initial
> allocation and then deallocate? I've tried some trivial examples, but
> can't seem to reproduce this situation. (I agree, this looks like a
> highly unuseful feature.)
>
> Adam
>
> Mladen Gogala wrote:
>
> >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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--
Mladen Gogala
Oracle DBA
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