• Subject: Re: Performance of *MAX4GB files vs *MAX1TB
  • From: "R. Bruce Hoffman, Jr." <rbruceh@xxxxxxxxxxxxx>
  • Date: Mon, 22 Nov 1999 20:22:34 -0500

-----Original Message-----
From: Scott.Lindstrom@zenith.com <Scott.Lindstrom@zenith.com>
To: midrange-l@midrange.com <midrange-l@midrange.com>
Date: Monday, November 22, 1999 5:34 PM
Subject: Performance of *MAX4GB files vs *MAX1TB


>
>
>Has anyone had a chance to see if it's worthwhile changing old physical
files to
>*MAX1TB to realize a performance benefit?  (Perhaps someone with a
standalone
>machine for testing)?
Well... a standalone machine won't answer your question. The major change is
seizes. Seizes on the 4GB indexes are performed at the root node, so the
whole index is seized. On the new 1TB indexes, the seizes occur at the leaf
node that is being updated.

So, if you have a very active machine and experience a large number of
seizes (say 400 people banging JDE software, for example) then changing to
the new indexes can probably improve your seize performance.

The only way to tell, as with so many other performance issues, is to try it
on YOUR machine and see.

In the worst case, no performance benefit will be seen, but hey, you don't
have to go back to the smaller indexes unless backward compatibility is an
issue.

===========================================================
R. Bruce Hoffman, Jr.
 -- IBM Certified AS/400 Professional System Administrator
 -- IBM Certified AS/400 Professional Network Administrator

"The sum of all human knowledge is a fixed constant.
    It's the population that keeps growing!"



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