RE: partitioning

Ok, I googled on row-migration and found more things on row chaining.  Is there 
a site or location for a white paper?

ciao,
Brian

________________________________
From: Mark W. Farnham [mailto:mwf@xxxxxxxx]
Sent: Monday, November 15, 2010 12:40 PM
To: tim@xxxxxxxxx; Zelli, Brian
Cc: 'oracle-l-freelists'
Subject: RE: partitioning

Nice, especially if the way a row gets to a "no longer active status" is from a 
row by row interactive update form.

If it is big chunks at a time, then the Gorman method of using partition 
exchange might be more suitable. That is more in line with your idea of once a 
month granularity. If that is what you're after, then once a month creating two 
segments (active and non-active) from your "current" table and swapping the new 
non-actives for a new empty "became inactive in monthname" partition and the 
extracted "actives" back with the active partition might make sense. Tim has 
written marvelous paper "Scaling to Infinity" (approximate title) about this 
whole process.

Making the final status NULL would keep any index on active status types very 
small and keep the index zero length on the value NULL partition in case 
partitioning pruning is not effective in any of your queries. If you're 
thinking about eventually archiving and purging inactive records, a column of 
the date last modified regarding the status might be useful as well. But I'm 
thinking that your first move doesn't really need composite partitioning and 
may never.

________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Tim Gorman
Sent: Monday, November 15, 2010 10:05 AM
To: Brian.Zelli@xxxxxxxxxxxxxxx
Cc: oracle-l-freelists
Subject: Re: partitioning

Brian,

Depending on how the status column gets updated, you could list partition on it 
and just enable row-migration.  That way, an UPDATE to the partition-key column 
would result in the row being deleted from one partition and inserted into the 
other.

Hope this helps...


Tim Gorman

consultant -> Evergreen Database Technologies, Inc.

postal     => P.O. Box 630791, Highlands Ranch CO  80163-0791

website    => http://www.EvDBT.com/

email      => Tim@xxxxxxxxx<mailto:Tim@xxxxxxxxx>

mobile     => +1-303-885-4526

fax        => +1-303-484-3608

Lost Data? => http://www.ora600.be/ for info about DUDE...

On 11/15/2010 7:15 AM, Zelli, Brian wrote:
Ok folks it's been awhile since I had to partition.  So the user wants the 
partition done once a month (for now) based on values in a column.  He wants to 
keep active-type records current and partition off completed or cancelled 
records.  So basically I would set up a script to run on the 1st that would 
look at the values and just partition off correct?

ciao,
Brian


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