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Great article "Look Before You %Lookup" by Susan Gantner and Jon Paris.

http://www.eservercomputing.com/iseries/articles/index.asp?id=498&dir=/iseries/articles/

Guy


------------------------------

message: 8
date: Wed, 12 Jan 2005 17:18:34 -0600 (Central Standard Time)
from: "Booth Martin" <booth@xxxxxxxxxxxx>
subject: I'd be interested in a discussion on the topic of LOOKUP vs.
        %LOOKUP


I'd be interested in a discussion on the topic of LOOKUP vs. %LOOKUP.

I have a program that must compile to target release V4R2. It has a process
that needs to be called repeatedly and it is a pig for time. I can
substantially reduce the number of times it is called by saving the result
to an array and checking the array first.


There are two ways to check the array that I am aware of. LOOKUP and
%LOOKUP. The difference in performance appears to be a factor of 10. Is
that to be expected in your opinion? Can LOOKUP take 25 minutes to run, and
%LOOKUP take 4 minutes?


Of course, %LOOKUP won't compile to V4R2 anyway.

So, what say you?  How to solve this pig of a performer?


--------------------------------- Booth Martin http://www.martinvt.com ---------------------------------




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