> Uncomited transactions can corrupt a database ?

No - but they can hold up other ations.

> How can i force a transaction to close after a defined time ?

If you are using the default settings on IBO, then that will
happen automatically. Check out TIB_TimeoutProps in the help
file, along with TIB_Transaction.

--
Lester Caine
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L.S.Caine Electronic Services