It's always been my impression that as the data is cleared the access paths
are maintained at that time.  Thus if you have a bunch of them the clear
takes longer.  I'm not aware of any "access path invalidation" although I'm
not as close to the system technically as I used to be.  Maybe this has
been improved over the last several releases, but it always seemed that the
same file with and without related access paths cleared in much different
amounts of time.



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