We have a 120 Gig datawarehouse that uses
more than 100 date-based partitions. For financial
and political reasons, we have run out of disk space
to give this database as it continues in it's relentless
growth.
The developers have resigned themselves to purge
out some of the old data and get rid of partitions that
are more than two years old.
We currently have about ten tablespaces that contain
all of the data and indexes for this database. There is
a small, medium, and large tablespace for data and
for indexes plus some other specialized tablespaces
by functionality.
Anyway, dropping a couple dozen of these partitions
is not going to be enough to free up some disk space
for us. Instead we're going to have to export our data,
drop the tablespaces, and recreate them as a smaller
size and then reimport the data minus the dropped
partitions.
Since we're going to all of this work, I'm wondering
if we should reorg these partitions by creating a tablespace
for each partition and a single datafile for each tablespace.
That way in the future, every time we want to drop a partition,
it will be very easy to reclaim the disk space associated with
that partition. I don't want to have to do these reorgs every
month.
How do most places physically lay out their partitions?
What is the downside of having a datafile for each partition?
Wasted space? Would a compromise be to assign
six months worth of partitions to a single tablespace?
We are currently on version 8.0.4 of Oracle on Sun Solaris 2.6
but we will be upgrading soon to 8.1.7. Looks like I may need
to reorg this before we can upgrade as we are rapidly running
out of room.
Thanks,
Cherie Machler
Gelco Information Network
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