RE: Defrag/Reorg Tool
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxx>
- To: "sharmakdeep_oracle@xxxxxxxxx" <sharmakdeep_oracle@xxxxxxxxx>, "dannorris@xxxxxxxxxxxxx" <dannorris@xxxxxxxxxxxxx>
- Date: Thu, 12 Feb 2009 17:51:47 -0500
You didn't mention database version, if you're using LMTs, autoallocate or
uniform extents, and whether or how much downtime you can tolerate for this
clean up.)
However, if you identify those segments that are taking up space at the 'end'
of the datafiles, and move those (alter table move, alter index rebuild), that
ought to be enough to solve your problems, as long as you don't run into
problems w/ the holes being smaller than the requested extent size of the
objects you're moving. If you can't tolerate any downtime, you may want to
look at DBMS_REDEFINITION.
Either way, it shouldn't be too hard to script it.
-Mark
--
Mark J. Bobak
Senior Database Administrator, System & Product Technologies
ProQuest
789 E. Eisenhower, Parkway, P.O. Box 1346
Ann Arbor MI 48106-1346
+1.734.997.4059 or +1.800.521.0600 x 4059
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ProQuest...Start here.
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Deepak Sharma
Sent: Thursday, February 12, 2009 5:29 PM
To: dannorris@xxxxxxxxxxxxx
Cc: Oracle L
Subject: Re: Defrag/Reorg Tool
I should clarify the need for this tool.
At some point we over-allocated the tablespaces. So, we have large datafiles,
but with lot of space not being used (holes) currently. We want to reclaim this
space, such as by shrinking (resize) the datafiles. But, since there are one or
blocks at the end of the datafile in a lot of cases, the shrink doesn't work
very well. If instead there is a tool that can move the blocks that are at the
end of the datafile(s) to somewhere in the beginning of the free space, the
resize could work.
HTH,
Deepak
________________________________
From: Dan Norris <dannorris@xxxxxxxxxxxxx>
To: "sharmakdeep_oracle@xxxxxxxxx" <sharmakdeep_oracle@xxxxxxxxx>
Cc: Oracle L <oracle-l@xxxxxxxxxxxxx>
Sent: Thursday, February 12, 2009 4:13:17 PM
Subject: Re: Defrag/Reorg Tool
I suggest you review a presentation by Tom Kyte on reorganizing objects that he
gave yesterday at RMOUG. I expect it should be on his website somewhere.
Short version: you probably don't need to do anything.
Dan
Sent from my iPhone
On Feb 12, 2009, at 3:00 PM, Deepak Sharma
<sharmakdeep_oracle@xxxxxxxxx<mailto:sharmakdeep_oracle@xxxxxxxxx>> wrote:
I wanted to get recommendations on tools for online reorg/defrag of
multi-terrabyte Oracle database.
Thanks in advance for your feedback.
-Deepak
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