RE: Question About DDMF

You can improve performance if you can do an update with out a read.
I.e.. Keyed Delete/write.  That way you are only sending the record
across comm. once.


Christopher Bipes
Information Services Director
CrossCheck, Inc.

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-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Pat Barber
Sent: Tuesday, May 09, 2006 8:47 AM
To: Midrange Systems Technical Discussion
Subject: Re: Question About DDMF

DDM does not not care where or how a file is updated.

It's only purpose in life is to "point" where the file in question is
physically located.

The program opening the file doesn't know or care where the file is
located.

Bad system design using DDM files will create a LOT of system overhead
that can not be fixed.

A program running on development machine updating a file on the
production machine "might" or "might not" create heavy traffic. That
depends on (1) Line speed (2) number of updates

If you are attempting to read and write thousands or millions of records
on every update, the overhead will be incredible.


Marvin Radding wrote:

> We are having a problem with programs on our development machine 
> updating
our production environment through a DDMF.  Is there a way to limit DDMF
to read only on the Production machine? Or a way to limit DDMF on the
development machine to read only? Gotta stop updating through DDMF.
> 
> Marvin
> 
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