RE: partitioning
- From: "Mark W. Farnham" <mwf@xxxxxxxx>
- To: <tim@xxxxxxxxx>, <Brian.Zelli@xxxxxxxxxxxxxxx>
- Date: Mon, 15 Nov 2010 12:39:30 -0500
Nice, especially if the way a row gets to a "no longer active status" is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
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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