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Basically the one time I rewrote a program based solely on performance was by measuring the I/O's. Then again, not a whole lot of people use RPG for nuclear theory or weather projection.
In my case the I/O's were very high. Huge detail file needed to be summarized to a fresh summary file. Original program read every row, checked summary file for a grouping row, if there wasn't one write it. If there was a grouping row update it.
Rewrite only wrote out to summary file at control break time.
There were many detail rows to each summary row.
We also journal all files so this cut way back on the number of journal entries too.
I remember it chopped it down from a few hours to minutes.
Rob Berendt
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