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Performance-wise, SQL isn't always the devil and RLA isn't always the silver bullet.
In a recent example, I had to tweak the performance of a program written by a SQL averse dev. The code had a pair of nested loops. The outer loop read sequentially thru an entire table. The inner loop read sequentially thru the same table (in its entirety) for each row from the outer loop. That's O(n^n), if I remember my Big-O notation properly. A simple SQL join took runtime down from 5 minutes to about 1 second.
-----Original Message-----
From: Roger Harman [mailto:roger.harman@xxxxxxxxxxx]
Sent: Wednesday, February 19, 2020 2:14 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Profiling RPGLE programs
Pretty sure it's all RLA. But, the access paths are definitely on my list of potential issues.
Patrick posted a link to an IBM page that looks promising.
Roger Harman
COMMON Certified Application Developer - ILE RPG on IBM i on Power
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