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Joe P. wrote:
And I'm not asking to be contrary, I would like to be able to
define a class of transactions that exemplify the need for CC!
Again, bank account transactions offer good examples. Bank accounts can have transactions posting from many sources and from multiple locations concurrently (over-the-counter, ATM, ACH, audio-response-system, bill-paying-service, Internet-home-banking, debit/credit-card-posting, automated-payroll-service, automated-fee-posting, automated-transfers, etc.
Funds may be available when a transaction is keyed, but unavailable a moment later when the posting key is pressed because in the interval a transaction may have occurred from another source. A hold could have been placed on an account during the interval. A stop-payment could have been keyed from another source, etc.
Over-the-counter transactions may be particularly complex. A customer may come to the counter with a payroll check and cash and want to allocate the deposit to checking, savings, IRA, loan, purchase of Disneyland tickets, and have everything on one receipt.
Without going into too much detail, let's just say that the transactions cause updates and writes to about 15 files, all of which are linked to a single receipt. The receipt essentially defines the transaction boundary. It may be a business requirement to commit (or rollback) the receipt as a whole - no partial updates - which could fail - not just because a record was locked - but because something happened to an account between the interval between when it was keyed vs. posted.
Nathan.
midrange.com
