> Is it can be useful to develop in the PC, api for DB2?
>
> The API will use my MFNetDisk 3390 data and the response time will be very
>very good from PC or any open systems platform?

This would be *very* useful if
1. It could be done without using the mainframe.
2. It supported JDBC & ODBC APIs.
3. It cost significantly less than current drivers. 

JDBC/ODBC access to z/os DB2 works well, but it's expensive (relative term). 
The cost for drivers, whether DB2 Connect or another vendor, is enormous. I 
have web servers, data warehousing, windows server apps and desktop 
clients all accessing DB2 data. If I want to add a CPU to webapp server, the 
driver upgrage fee is more than the cost of the entire server.

Secondly, z/os CPU cycles are perceived as expensive. Offloading query 
processing to a windows box is desirable. In a small shop such as mine, it's 
much easier to fund a Windows server than a ZIIP. I've even taken to 
shadowing some DB2 tables to SQL Server tables for use in queries. 

-Rob Wunderlich

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