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Irrespective of DYNSLT, the join is dynamic. Without DYNSLT the
selection is built into the index objects created to implement the join
and selection. If the join fans out extensively, the performance will
be worse than when it does not. Does the selection eliminate a large
number of records from the file; the request to DSPFD of the LF will
show the "Number of index entries" for each based-on file.
The given JLF DDS source appears to add the second file but not use
any data from that file; i.e. no fields prefixed with B3E are included,
neither in the format nor in the selection. Is that joined file perhaps
causing a large and unexpected fanout, that is then being reduced by the
selection?
Regards, Chuck
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