Subject Opnions on this...
Author Carlos H. Cantu
Hi everybody !

I would like to ask what would be your approach on the following situation
(a very common scene in Brazil) :

The situation : Many people working at the same time creating and printing
comercial invoices. Here is very common to have an invoice payment divided
in 3 or more parcels, each one with a diferent expiry date.

As you can guess, the invoice total (and other fields) are calculated based on the invoice
items (items = detail table), so you only have the invoice total when all
the items were entered. Each item, when the transaction is commited,
fires a trigger that will (among other things) update the stock of that

The parcels are stored in separated table and actually the inserts are done
automaticly (stored procedure called from an after_insert trigger) when the
order is posted.

I can put everything inside a unique transaction, but it is not a good
thing to have all the invoice lost if, at the commit time, IB reports a
deadlock (maybe some other guy did another invoice using the same item and
so updating the stock = conflict).

There is much more complexity than I'm exposing here (actually some
triggers also updates other tables that deal with quarrels, etc...)but at
the moment I would like to hear your comments on how to make the above
process in a way to minimize deadlocks.

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