X3 on using ACS and Visual Explain as Vern has suggested. You can see so much information with that tool.

However, I can tell you from experience that creating the EXACT index will not always eliminate a Temporary Hash Table built by the SQE. Sometimes the SQE (erroneously in my opinion) determines that a temporary hash is faster.

I have a case open with IBM right now... the temporary hash takes 18 seconds to create. When the index is used, the entire query takes 1-2 seconds.

Best of luck.

-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Sean Courtney
Sent: Monday, January 31, 2022 9:39 AM
To: rpg400-l@xxxxxxxxxxxxxxxxxx
Subject: SQL Index builds
Importance: High

Hello everyone,

maybe someone else also had similar issues.

Sometimes when I join tables in SQL a temporary index is built during

I tried to counteract this by adding new LF's and indexes . sometimes it
works and sometimes it doesn't.

Is there a way to find out how sql builds these indexes ??

If yes could someone please give we a quick update on how to find the index
definition. If I were to create these indexes permanently then I would

Improve runtime performance considerably ..

Mit freundlichen Grüßen / Kind regards / Bien à vous,


As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.