Re: 2GB or not 2GB (datafile limit)? That is the question.

  • From: William B Ferguson <wbfergus@xxxxxxxx>
  • To: Rich.Jesse@xxxxxx
  • Date: Fri, 8 Sep 2006 08:29:59 -0600

I don't think so. The only real reason I can see would be it's easier and 
faster to restore two or three 'corrupt' files of 2GB than a whole 100GB 
file, but in the Oracle environment, that probably doesn't make any 
difference, as you'd still probably need to restore all of the associated 
2 GB files for that tablespace, and multiple small files take longer than 
one large file.

It might make a difference with many disks, as you could have the smaller 
files (even if they were 25 GB), spread across multiple disks, so multiple 
reads could be accomplished faster, instead of back and forth within the 
same file on the same disk (or am I dating myself here?).

                               Bill Ferguson
            U.S. Geological Survey - Minerals Information Team
                           PO Box 25046, MS-750
                           Denver Federal Center
                          Denver, Colorado 80225
           Voice (303)236-8747 ext. 321     Fax   (303)236-4208
      ~ Think on a grand scale, start to implement on a small scale ~

"Jesse, Rich" <Rich.Jesse@xxxxxx> 
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
09/08/2006 08:16 AM
Please respond to


2GB or not 2GB (datafile limit)?  That is the question.

Many moons ago, way back in the 32-bit era when Y2K was a looming
nightmare, I had instituted a policy that no Oracle datafile would be
setup to grow larger than 2GB.  This was due to some known bugs with
files larger than 2GB on many platforms/filesystems at the time.

As I'm now looking at a vendor's ERP installation, I was about to reduce
their max datafile size from 32GB to 2GB when I asked myself "Why?".  Is
there any valid sane reason to do this anymore?  I do not expect the DB
size to grow beyond a modest 100GB in the next two years.  The server is
an IBM P5 blade running AIX5.3 and using JFS filesystems.  Other similar
servers with other DBs (e.g. Sybase) currently handle db files in the
100's of GB with no problem.

I don't see any need to limit the datafile size to 2GB anymore.  Anyone


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