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As Aaron points out, a lot of RPG programmers don't do any
COMMIT/ROLLBACK.
If so, they've never worked for a bank. If a customer gives cash to a teller, you'd better make sure that when you add a record to the transaction history file, you also update the balance of the person's account, and update the teller drawer file, and update the general ledger, and so forth. Otherwise it's going to cause a lot of trouble when someone tries to figure out why the various account balances and histories are out of sync.
However, if your application is just basic create, read, update, delete of single records in a single file, commit/rollback would be over-kill.
Nathan.
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