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There is always a possibility. But the chance of it happen is very low
since each thread processes a different customer. My other option is to put
a Physical file that is key by RRN and chain back to it by RRN and perform
update on it. But this method also has it's own ugly problem. If it is a
brand new program, it wouldn't be so bad. But it is an existing process and
it is quite a massive process to deal with. If you have dealt with Billing
or Invoicing process before, you probably knows that this type of process is
not of those that you want to make a mistake on.
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