Re: Qualified vs Unqualified calls (Was: Database server jobs and SQL tuning)

[John Earl <johnearl@xxxxxxxxxxxxxxx>]

Bob,

Bob Larkin wrote:

> John,
> Great work. Now for some real fun, have your program open a file, read a 
>record, then
> return. After that, try leaving LR *OFF.

Because we were testing to see whether there was a performance difference 
between
qualified and unqualified calls, the program was written so that it would do 
the least
amount of work.... thereby minimizing other complicating inputs to the results. 
 The
*INLR *ON approach was selected in order to ensure that the extra perfromance 
penalty of
re-opening (and resolving authority to) the program _was_ incurred each time.  
The
excercise was to measure the cost of qualifying a program call, so I tried to 
design the
test to isolate (as much as possible) that event.


> The only reason I mention that is that there can be great savings there. I 
>ran into a
> situation where program A was calling Program "Tax Calc" several times for 
>each
> transaction. The transactions were telephone calls, so there were many 
>millions per
> cycle.  A minor change to keep the "Tax Calc" from closing the files and 
>going away
> resulted in a reduction from 11 HOURS to 17 Minutes!!!

I don't doubt it.  Leaving the program and the files open in that situation is 
the right
thing to do, and bound to return better performance results.  Hopefully nobody 
is using
my little test program as an example of the right way to code!  :~)

jte


--
John Earl                               johnearl@400security.com
The PowerTech Group                     206-575-0711
PowerLock Network Security              www.400security.com
--


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