RE: Online "tablespace" reorg ?
- From: "Herring Dave - dherri" <Dave.Herring@xxxxxxxxxx>
- To: <bobmetelsky@xxxxxxxxxxx>
- Date: Wed, 29 Jun 2005 13:13:11 -0500
In terms of reclaiming space, at least at the datafile hwm, I see a
point to reorganizing within the datafile, which really just involves
recreating or moving (twice) give objects who have extents sitting at
the hwm. Its about the only way to shrink datafiles, when tight on
space at the DASD level, when gaps of space exist throughout a datafile.
Dave
-------------------------------------
Dave Herring, DBA
Acxiom Corporation
3333 Finley
Downers Grove, IL 60515
wk: 630.944.4762
<mailto:dherri@xxxxxxxxxx>
-------------------------------------
> -----Original Message-----
> From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> On Behalf Of Bob
> Sent: Tuesday, June 28, 2005 10:43 PM
> Cc: oracle-l@xxxxxxxxxxxxx
> Subject: Re: Online "tablespace" reorg ?
>
> A little more information of my environment . These are all DSS -
> Oracle 10.1.0.3.0 on HPUX 11.1... Database sizes are from 5 - 20TB
> The largest table space approx 800GB containing approx 20-50
segments,
> tablespaces average about 200GB +-
>
> 90% are DMT & no ASSM
>
> We are concerned with reclaiming space and switching to LMT and ASSM.
> Im thinking of creating new tablespaces with these attributes find the
> dependent segments and alter table move... and recreate the indexes.
>
> I suspect CTAS involves more TEMP space and therefor slower, where I
> believe move creates a copy of the table and then drops the old and
that
> can be done online (off peak)
>
> as far as online table reorg, there is dbms_redefinition which
allows
> modifying columns etc...
>
> Just wondering others opinions of
>
> 1- reclaiming space with such large objects
> 2 - opinions on using ASSM
> 3 - recommendations from others who have "been there" :)
>
> Thanks!
> Bob
>
> Allen, Brandon wrote:
> > Hi Bob,
> >
> > No, I don't believe there is anyway to do an online table reorg,
much
> less an online tablespace reorg. There is an ONLINE option for the
ALTER
> TABLE . . MOVE statement, but unfortunately it is for use with IOTs
only.
> >
> > I think your only options are to use the ALTER TABLE . . . MOVE like
> you've already mentioned, or to use exp/imp, with a drop/create of the
> tablespaces in the middle to recreate the tablespaces as LMT w/ ASSM.
> >
> > Regards,
> > Brandon
> >
> >
> > -----Original Message-----
> > From: oracle-l-bounce@xxxxxxxxxxxxx
> > [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Bob
> > Sent: Tuesday, June 28, 2005 2:54 PM
> > To: oracle-l@xxxxxxxxxxxxx
> > Subject: Online "tablespace" reorg ?
> >
> >
> > All-
> > Is there such a thing as online tablespace reorg?
> >
> > All, I've been tasked to perform an "online reorg of our
tablespaces"
> > From my research I come to these findings.
> >
> > 1 - tablespace reorg is not a popular topic and only seems to be
> available
> > using oem which due to our diverse environment, I need to use a
> > sqlplus script. From reading ask tom he is claiming there really
isn't
> > anything to "reorg" in a tablespace - recreate yes - reorg no
> > Is this correct?
> >
> > 2 My plans would be to create new tablespaces using LMT and ASSM,
then
> alter
> > table move .. new tablespace. The LMT would minimizes future
> fragmentation
> > and ASSM would benefit by using the alter table shrink; statement to
> alter
> > the HWM in the future.
> >
> > Questions,
> > 1 - Is there such a thing as online reorg of tablespaces and if so
> > documentation on its use?
> > 2 - Are there any issues that I'm overlooking in item 2
> >
> >
> > Thanks
> > Bob
> >
> > side note -dbms_refefination looks like what I've been told to look
for
> but
> > that is on the table level and not going to help because the
tablespaces
> > are DMT. I don't need to redef the tables I'm really looking to
reclaim
> > space from the tablespaces as well as putting the tables in LMT and
ASSM
> > mode
> > --
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