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Posted by Jerry Stuckle on 01/23/06 16:33
Geoff Berrow wrote:
> Message-ID: <cuednQYv09gBwkneRVn-iA@comcast.com> from Jerry Stuckle
> contained the following:
>
>
>>So the system recomputes the balance. If there are sufficient funds in
>>the account, it processes the withdrawal.
>
>
> Isn't a lock required for the very short period of time in between
> recomputing the balance and processing the withdrawal?
>
Yes, but that's a very short time - on a mainframe you're talking
microseconds; milliseconds at the worst.
You can never eliminate all locks. The secret is to minimize the number
and length of the locks.
--
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
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