Re: Early Client Server on the AS/400

[Pat Barber <MBOCEANSIDE@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

nina jones wrote:

> 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.

DDM if used correctly, can be very effective, but the programmer must be
aware of what happens when a file is accessed and HOW the file is
accessed..
There isn't any difference between a "local" or "remote" file using
DDM...
The major difference is how those files are accessed... If your program
needs to access a huge file by key, it will work, but it will work very
slowly because of bandwidth, but if you just need to access a "few"
records
using chain,setll,etc... the response time can be quite good... It was
never
intended to be used as a major file transfer facility, although, it will
do
that if you wish... File access type is the key to DDM.... Application
must be designed for DDM for effective use....
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