Re: RPG - MsSQL Connection

Not quite true Scott...

I know MS SQL Server's linked servers support joining between tables
on multiple systems; as does Oracle's Generic Connectivity feature.
I'd guess IBM's DB2 federation product does also. That's one of the
points to a federated DB in the first place.

Of course the way it works is that behind the scenes, the DB pulls
rows from the remote DB into a temporary table. If the DB is smart,
it should only pull what it needed. But for instance, I believe MS
SQL server takes the easy route and just pulls every row from the
remote table. Obviously not ideal when you only need 5 rows out of a
million from the remote table. :)

Charles

On Thu, Sep 9, 2010 at 2:34 PM, Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx> wrote:

Just to be clear..  it might be possible to join two DB2 tables from
separate systems, or two SQL Server tables from separate systems...  but
you'll never be able to join a SQL Server table to a DB2 Table.

Why not?  Because they're handled by separate query engines.  The DB2
query engine doesn't know how to use a SQL Server table or index.  The
SQL Server query engine doesn't know how to use a DB2 table or index.


On 9/9/2010 12:09 PM, DeLong, Eric wrote:

Just wondering how to handle the need to join a remote table to a local
table?  As an example, perhaps I need to retrieve rows from a MS-SQL
Server, then update a local table to match the remote.  If using
ARDgate, would I need to connect to the remote, then make a copy into a
local temp table, then connect to the local DB2 to process the update
statement?  I understand that DB2 Multisystem could handle concurrent
access (federated DB), but otherwise is not supported on IBM i.

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