As some of you mention that implementing threads will make the DB work
harder than the standard serial operations queries, let me ask you
these then:

* How often does your DB server(s)/cluster utilizes 100% CPU (SMP/MC),
memory, and disk IO?
* How long is the duration when 100% utilization occurs?
* If you could implement threads and run those same queries in 2+
threads, the total time saved from queries execution is 1/2 sec or
more, which is pass along as the total response time reduced.  Is it
worth it for you implement threads if you're a speed freak? (I
remember a list member, not mentioning his name, does optimization of
PHP coding for just microseconds.  Do you think how much more he'd
benefit from this?)
* If the requests are executed in parallel, the sooner the request
fulfillment completes, the faster it is to move to the next request
and complete it right?

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