Re: Early Client Server on the AS/400

["Carl Galgano" <cgalgano@xxxxxxxxxxxxxxxxx>]

Nina:
DDM just does a chain to the remote system and only returns the data that
you requested over the comm line.  The whole file definitely does not have
to be transfered.  This is done via an ICF file.  The source system evokes a
program on the target system that retrives the record requested via the
CHAIN, and then only returns the record requested.  Note though that the
entire RECORD is returned, not just the field you need.
Carl
Carl Galgano
EDI Consulting Services, Inc.
540 Powder Springs Street
Suite C19
Marietta, GA  30064
770-422-2995
mailto: cgalgano@ediconsulting.com
http://www.ediconsulting.com
EDI, Communications and AS400 Technical Consulting

-----Original Message-----
From: nina jones <ddi@datadesigninc.com>
To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date: Saturday, January 02, 1999 11:02 AM
Subject: Re: Early Client Server on the AS/400


>> My point was more that DDM is unfairly blamed as slow when the real
problem is generally elsewhere.
>> Usually whith the programmer of the application -- although not much can
be done if the communication
>> line speed is simply too slow.  A lot of programming stupidities are
masked by local data access.
>> Remote data tends to highlight those flaws and then the tool is blamed
rather than the worker.
>>
>> Your original comments implied that the entire file needs to be
transmitted to the source system which
>> isn't true.  That's really what I wanted to clear up.
>
>really.  i didn't know that.
>
>but how?   for example, in our application, there is a chain to a 250 byte
file to get a 4 digit catagory
>code.  since the application is running on the source system, how do you
just get from the target the data you
>want, without transmitting the entire file?  i haven't looked at ddm for
some time, but i didn't think that
>was something you could control.
>
>nj
>
>
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