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  3. March 2008

Re: Why non-keyed PFs back then? Why today? ( was Re: Which of theSYSIBMtables/views show the row count for )

Joe,

I won't argue the technical details of the concept. I can only offer
the empirical results: a non-unique keyed physical file takes
approximately 15% the time that a unique keyed physical takes to insert
a row.


I thought this was attributed to the suppression of blocking when a unique
key constraint exists. With a unique key, it must check with each insertion
if there is a key violation. When not unique, then it can buffer blocks of
insertions.

Doug

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