Duplicate Key / tuning

[Dan Rasch <drasch@xxxxxxxxxxxx>]

I am in the middle of a large conversion, where during the 'big bang' - we
will encounter numerous duplicate keys.  The data comes from a mainframe,
and making the file truly unique first would probably be as large a task
as the conversion itself.

My question regards the nature of the I/O involved for a duplicate key.
Is there a way to reduce the processor time the machine uses to determine
a duplicate key exists?  We looked at the file description, and nothing
was obvious.  The language is COBOL, and rewriting the code is less tahn
desirable (although I personally feel a START in the proper paragraph
would do wonders)....... 

Dan Rasch - because if the human species concentrated on the really 
important things in life, there would be a shortage of fishing poles!


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