Re: Partitions on RAID 5 SAN and Tablespaces

From: Steve Howard <>
Date: Tue, 25 Mar 2008 16:46:46 -0700 (PDT)
Message-ID: <>

On Mar 25, 3:51 pm, zip <> wrote:
> Does it make any sense to partition an extremly large table by
> tablespace in a SAN RAID 5 environment or just put the partitions in
> one BIGFILE tablespace? I can see using tablespaces to put the files
> on different spindles, but in a SAN is this necessary?
> Anyone had any problem putting a very large (50 G) partition table
> into one BIGFILE tablespace?
> Zip

Hi Zip,

It's always relative, but believe it or not 50GB isn't that large. I would put it in multiple tablespaces, though, based on experience. We did this with a 2TB table last summer that was otherwise completely unmanageable. We can now shrink a partition if need be and reclaim the physical space, since each partition is in a separate tablespace. If you don't do this, and you shrink a partition at the "front" of the datafile, you may not be able to shrink the datafile.

You also have to backup the entire table in RMAN at one time if its in one tablespace. You can back up different partitions one at a time if its in separate tablespaces. That's where we get the most bang for our back with partitions.

HTH, Steve Received on Tue Mar 25 2008 - 18:46:46 CDT

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