opnqry efficiency question

["Mark A. Manske" <mmanske@xxxxxxxxxxxxxxxxxx>]

Hi all;

I am not sure if I am from the old school or the new - here is my question;
I have proved in one particular program my way is more efficient; however I
am wondering
which way is "truly" more efficient as my IS manager was "taught" one way,
and I forget now if I was taught or just out of being a "control freak" in
RPG and not
wanting to relinquish anything to C/L that I code the way I do...

He has always tried to do opnqry before the program call to trim down the
data as far as he can before calling the program - I do not have faith in
opnqry as I have seen
it drop records it should not have (PTF's "probably fixed this) so I tend to
just take the file as is and code for my selection criteria.

In a test today running it his way took 39 seconds, my way took 17 seconds.

Now I do not know if this would hold true in all instances..

I guess I am wondering at a bare metal level, say you leave the key as is,
but only put selection criteria in, does it matter...
On the flip side, just how much system resources are "wasted" say for
creating a opnqry over a file with a completely different key??

Any thoughts??

TIA

Mark A. Manske
[mailto:mmanske@minter-weisman.com]
Sr. Project Lead
Minter-Weisman

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