RE: DDM for dummies?

Assuming the i-Series has the underlying services working (and I'm
sorry, I can't say exactly what those are - perhaps others could supply
the details?) using DDM files are quite straightforward.

The DDM definition allows a logical connection to a remote database.
You define the DDM file on the local machine, and within that definition
is the actual physical target file that would be accessed. The target
file does not need to exist at the time the DDM definition is created
(and therefore creating the DDM definition does not cause any
validation). The target file only needs to exist at the time the file is
accessed.

Once the DDM file is in place, the program treats the DDM definition as
a local file and does not behave any different to a normal file.

*devil in the details*. The 'magic' of DDM is the underlying system
services that provide the communications. You will almost certainly need
to work with the WRKDIRE Directory Entries commands for the device names
to resolve. Depending on the other services you have running this might
be all that's necessary. Assuming that the i-Series has the necessary
components loaded, the 'using' of DDM files I've found quite simple. I
wish I could offer more about the underlying communications
configurations, but the system I administrate now hasn't given me any
arguments about DDM files (yet) and so I haven't had to dig any deeper
than the CRTDDMF command.

Best wishes

James P. Wiant
Testing Coordinator
Foodstuffs, Auckland, Ltd.
60 Roma Road
Mt Roskill
Auckland, New Zealand 1041
09-621-0774
jim.wiant@xxxxxxxxxxxxxxxx






Quality is everyone's responsibility
W. Edwards Deming


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of James Lampert
Sent: Monday, 23 February 2009 9:17
To: 'Midrange Systems Technical Discussion'
Subject: DDM for dummies?

I've got a situation on a customer box, where I'm being asked to access
a DDM file connected to a file on one of their other boxes.

Unfortunately, having never dealt with DDM files before, I'm having
trouble accessing it.

According to everything I read, I should be able to access it from RPG
as if it were the actual PF to which it is connected. No joy.

According to everything I read, I should also be able to CPYF it onto
the box where my code lives, to take a look at it. When I do this, it
just sits there, keyboard locked, until I SysRq-2 it, at which point, if

I look at my local copy, I get (as Anne Robinson would say) nothing.

Any idea what I could be doing wrong?

Authority to the DDM file is *PUBLIC *CHANGE.