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<Rob>
Yes the tables are journaled. However the count of journal entries are
identical (or pretty darn close).
In the joblog the longest period of time is eaten up by this program:
CALL PGM(ERPLXPTFO/CST600B)
CST600B SQLRPGLE CST600B-Load Std Costs from Routings
Based on the day the runtime of this program varies widely.
</Rob>

... as I mentioned before, I/O% doesn't vary. so runtime seems to be related to I/O work. journals give a picture of the write operations. For the RPGLE programms DB-Monitor would be the tool of choice.
If you don't want to start DBMON in the night time, you could start it time scheduled (be sure, that you've enough dasd available) - choose the details. Before analyzing the data with oops nerv, you should delete the data of the other jobs, so it is easier. First I would have a look to are the most expensive statements and the overall count of database operations. Now you could have an estimate what the programm is doing half of time (other half is cpu).

Next step would be waiting for along run and compare.

You must first get an idea why the programm takes the time it is taking and what it's doing.

D*B

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