But the original poster was referring to a truncate
... aka Enron using your metaphor :-)
Cheers
Connor
- Ron Rogers <RROGERS_at_galottery.org> wrote: > Good
point Robert,
> The reason the index space still exists after a lot
> of deletes is the
> method the index is stored in the database. very
> similar to the old
> organization chart of a large corporation. If you
> eliminate all of the
> people between the CEO and the janitor you still
> have the multiple
> levels displayed on the chart. The may be vacant and
> just pointers to
> the next lower level but the still exist on the
> chart. Indexes are
> stored the same way. One block points to the next
> and so forth from the
> top to the bottom. Remove all of the data between
> the two and the "path"
> from the top to the bottom still exists thus the
> index storage is still
> used. If you export the data, truncate the table and
> import the data the
> "path becomes top-to-bottom one step and the old
> index storage area is
> freed up. The janitor then reports directly to the
> CEO.
> Ron
> ROR mª¿ªm
>
> >>> Robert_Freeman_at_csx.com 04/09/02 06:33PM >>>
> There is not a HWM indicator for an index as there
> is for a table.
> When a truncate occurs, the blocks are cleared in
> the index and the
> extents (beyond the initial extent) are deallocated
> (assuming you do
> not
> issue the reuse storage clause).
>
> RF
>
> -----Original Message-----
> Sent: Tuesday, April 09, 2002 5:52 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hello,
>
> Lisa, what I was wondering when I read Rick's e-mail
> was... what about
> the
> HWM for the indexes when someone truncates a table.
> The table's HWM
> pointer
> gets reset of course, but I can never recall seeing
> anything about
> what
> happens to the index space.
>
> Thank you,
>
> Paul Sherman
> DBA
> voice - 781-501-4143 (office)
> fax - 781-278-8341 (office)
> email - psherman_at_elcom.com
>
>
> -----Original Message-----
> Sent: Tuesday, April 09, 2002 5:33 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hi Rick,
>
> Nope. Try it. You'll see that the extents clear up
> just like the
> extents
> in the table do, if you don't specify the REUSE
> STORAGE clause.
>
> Lisa Koivu
> Oracle Database Tank
> Fairfield Resorts, Inc.
> 954-935-4117
>
>
> > -----Original Message-----
> > From: Rick_Cale_at_teamhealth.com
> [SMTP:Rick_Cale_at_teamhealth.com]
>
> > Sent: Tuesday, April 09, 2002 5:11 PM
> > To: Multiple recipients of list ORACLE-L
> > Subject: Does index need rebuilding when table is
> truncated
> >
> > Hi All,
> >
> > I know if you delete lots of data using delete the
> indexes may need
> > rebuilding. Is this the case if the table is
> truncated?
> >
> > Thanks
> > Rick
> >
> >
> > --
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> http://www.orafaq.com
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> > Author:
> > INET: Rick_Cale_at_teamhealth.com
> >
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Received on Thu Apr 11 2002 - 08:23:23 CDT