Allen, Mark wrote:

Big snip........

Just as a test, try this:

Sort the file down by the L1 fields and create a modified version
of program to read the sorted results.... Use LARGE blocking on
sequential input..... I suspect, the keys, are badly spread out and
the read by key is really killing you.... I know sorts and sequential
processing is out of date but some times, this is the very fastest way
to process a fairly large file.....

If you don't like the sequential idea, at least copy the file and reorg
get the keys in a little "tighter" order...... Key sequence is slow by
very nature.....
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