RE: Online "tablespace" reorg ?

  • From: <Paula_Stankus@xxxxxxxxxxxxxxx>
  • To: <bobmetelsky@xxxxxxxxxxx>
  • Date: Tue, 28 Jun 2005 23:45:05 -0400

Last I heard ASSM was buggy.  I would search on ASSM in the archives.   

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Bob
Sent: Tuesday, June 28, 2005 11:43 PM
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Online "tablespace" reorg ?

A little more information of my  environment . These are all  DSS -
Oracle  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" :)


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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