Re: Combine Logical

["Booth Martin" <Booth@xxxxxxxxxxxx>]

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Underlying rules I always look for in this scenario are:

1 - Are the most restrictive selections done first?  if you need ALL Males
with Brown Hair and born in 1983, look for 1983, then brown hair, then Male.
 That will eliminate many, many selection steps.

2 - Do I really need the K in the F-spec?  If the whole file is being
processed anyway, why do I have to do it in alphabetic order?  Why not just
use arrival sequence?  Improvements of 75+% are possible sometimes with this
single step.

3 - Can an intermediate file be built?  Instead of the multiple joins, could
a new intermediate file be built with only the needed data, and then the
actual program run from the intermediate file.

These steps are just steps I look at.  They rarely solve the problem by
themselve but quite often they prompt a light bulb to light.



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Booth Martin   http://www.MartinVT.com
Booth@MartinVT.com
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-------Original Message-------

From: rpg400-l@midrange.com
Date: Friday, April 19, 2002 04:53:03
To: rpg400-l@midrange.com
Subject: Combine Logical

Hi,

We have an RPG program that reads a combine logical file which contains 3
combined
master files (approx. 4 million records per file). This program takes
several hours to run.

Is there a better alternative logic that will speed up the performance of
an RPG program
with or without using a combine logical file ?

Thank you in Advance,
Jonathan

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