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N-Tier Archicture
Proposed Environment:
WIN2K IIS web servers
WIN2K server(s) for COM/COM+
WIN2K SQL Server 7
VB 6 - Primary tool
C++ - Where needed on COM layer
Hello everyone -
I have a new client I am working with who has programmed themselves into
a corner (oh yes, we've all been there) and I am now charged with archicting
them into the future.
My biggest concerns are the middle tier issues like:
-- Should we put both COM servers for Business Logic and Data Abstraction
- ie all COM components on the same servers.
-- How big is the cost going to be to marshall data across Tiers where each
Tier represents an actual set of servers ?
My biggest disaster at present:
-- My client has ( do not laugh now ) maxed out the number of fields allowed
in a SQL Server 7 table - ie there are over 250 fields per table in many
of the key tables ( and yes, there are SELECT * in the ASP Pages ). My approach
will be to create a Data COM layer FIRST, where all data will be accessed.
This will allow me to change the underlying schema to a more efficient without
heavy re-writes on the front end ASP. Thoughts ?
The complete application must end up being highly scalable and able to handle
over 5,000 concurrent users during a registration process. And the only way
we can attack the application re-writes is in an evolutionary approach and
not a complete re-write.
Thoughts ?
Thanks,
Craig
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