I am attempting to implement, what I believe to be, an unusual
scenario, and am hoping to find someone that has experience with
something similar. I currently have a series of physical and logical
files on an iSeries (AS/400, System i5, or whatever IBM calls it
today), version v5r4, and would like to permanently migrate them to a
DB2 UDB for Linux v8 system. All of these files are used by native
iSeries programs (written mostly in CL and RPG), and some are used by
SQL programs, as well. The goal is to make the migration as
transparent as possible, so the programs operate as if the files were
still local.
My first thought was to configure the two systems to communicate via
Distributed Relational Data Architecture (DRDA) facilities, since both
support it. Then I could create a DDM file on the iSeries that linked
to the remote table on DB2 for Linux database.
I still have several questions/concerns about this approach, and if
anyone can provide advice or hints, it would be greatly appreciated.
1.) Can the native RPG/CL programs perform all of their normal
functions on a remote DDM file, including locking a row, read or
position by a key value, update, delete, etc.
2.) How would I configure tables/views/indexes on the DB2 for Linux so
that they are equivalent to the physical and logical files on the
iSeries. For example, a physical file seems equivalent to a SQL
table, but has an optional index as part of the same object. Does this
mean I create a SQL table with an index, and point the DDM file to the
index, and not the table?
3.) Finally, is there another approach that I am not considering that
would meet my requirements? I've looked at the possibility of using
Websphere Federation Server and DB2 Connect, but they seem to only
work via an SQL interface, so the native programs would all have to be
modified to use embedded SQL. This is not really an option because of
the large number of programs in question.
Again, I'd appreciate any advice from someone that has tried something
like this, or even remotely similar.
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