AS/400 9402

[mtanveer@xxxxxxxxxxxxxxxx]

I HAVE A AS/400 9402 AT HOME JUST FOR LEARNING PURPOSE.  I HAVE V3R1 ON IT.
JUST WONDERING I CAN USE THIS MACHINE FOR JAVA. ANY IDEA.

Thanks


-----Original Message-----
From: owner-java400-l@midrange.com
[mailto:owner-java400-l@midrange.com]On Behalf Of Alex Garrison
Sent: Friday, November 12, 1999 4:33 PM
To: JAVA400-L@midrange.com
Subject: Fw: Fw: forcing native access with websphere and toolbox


Joe,

It definitely does have a huge impact on our dasd utilization for just the
reason you stated.  However, 8.5gb drives for our as/400 are only $1600
installed, so dasd is cheap.

Legacy impact: again definitely a concern.  We had to recompile/modify all
rpg programs that use these files.  All the rpg code is ile sql rpg.  We
found the evals still were ok, but moves had to account for the fields being
twice as many bytes.  It took about a day to fix all that.  However, we were
very fortunate in that our design isolated the web system from the main body
of our legacy system (millions of lines of rpg and thousands of files)
through a series of data queues.  Any data in/out of the web systems move
through these data queues, so we really only had to fix the legacy code that
interfaced the web databases to the dataqueues.

When you are desperate for performance, you will try almost anything.  In
balance conversion to unicode was rather painless, and a 25% performance
gain is nothing to sneeze at.


----- Original Message -----
From: <Pluta@nexgensoftware.com>
To: <JAVA400-L@midrange.com>
Sent: Friday, November 12, 1999 1:01 PM
Subject: Re: Fw: forcing native access with websphere and toolbox




Alex Garrison wrote:

One of the things the performance guide recommends is to  change your
physical files to use ccsid 13488 (unicode) for all character  data. This
is supposed to speed things (...)
----------------
While I see how the conversion would benefit your Java programs, I do have
a certain concern... unicode requires two physical bytes of storage for
each character.  If you have large character fields, this could
significantly increase your DASD requirements.

Also, what's the legacy system downside?  Doesn't this actually ADD
conversion requirements to legacy systems?

There is a certain sense of "baby with the bathwater" in switching the
storage technique for character data in order to improve performance.

Joe



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