RE: design question, how to handle this project -- JAVA400-L

Hi
Thanx for the emails, now that i have some more idea
about my project, this is a MRP system which maintains
inventory etc, so i have to build a web interface
which  will collect information from all the AS400
systems and display them in one page.
1) I can develop "agent", which is a java program
which is knows the database(different versions of my
application), and i call this java program which will
extract data from AS400 and return it to my main
application to display.
2) DO you suggest to use MQSeries or ome messaging
service to get data, instead of using JDBC .
3) How can i make the process parallel, so instead of
going one database at a time, spawn a web of request
and get the data from different systems?

Thanx for all the help
Ashish 

--- Joe Pluta <joepluta@xxxxxxxxxxxxxxxxx> wrote:
> > From: Joe Sam Shirah
> > 
> > in a homogeneous environment ( which can here
> > be expanded to any system with a DBMS and JDBC
> driver ) that just
> wants to
> > grab the data for processing, these layers
> introduce complexity and
> impact
> > performance.  Remember that SQL provides a
> standard for formats too
> and
> > you can just talk directly to the DBMS engine over
> the network.
> 
> If it's a truly homogenous environment, DDM is
> another option.  I
> haven't compared DDM to JDBC access over a network,
> but it's certainly
> something to consider.
> 
> Another issue is whether this is a pure query or a
> data consolidation
> environment.  Depending on the complexity of the
> data to be returned, a
> message based approach with remote data queues may
> be an option as well.
> It does require code on the client, but it may not
> be a bad idea.
> 
> There are also security issues.  A typical JDBC
> approach would require a
> database of user IDs and passwords on any machine. 
> That's one of the
> knocks I always have with JDBC.  Until a better
> network-wide
> authentication mechanism is in place, this is a
> security hole that could
> cause fits in an audit.
> 
> You also have the issue of whether or not the data
> from the multiple
> machines is itself meant to be collated.  That is,
> do we want data from
> machine one interleaved with data from machine two? 
> That's beyond the
> capabilities of any of the mechanisms discussed so
> far, and in fact
> might best be handled by a tiered client/server
> interface.  There are
> two answers for this business problem: you can
> either read all the data,
> write it to a temporary file, and then reread it in
> the correct
> sequence, or you can read it one record at a time
> from each machine
> using a controller to perform what would in effect
> be matching record
> logic.  The latter is far more effective and much
> better from a
> performance standpoint (especially when optimizing
> to get the first page
> out as fast as possible), although at the cost of
> extra overhead.
> 
> As usual, the question is not as simple as "how do I
> do this?"  It is
> instead "what are the possible solutions and which
> best fits my business
> requirements?"  And without a better idea of the
> business requirements,
> any advice would be incomplete.
> 
> Joe
> 
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> 


=====
A$HI$H


        
                
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