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You definitely need to get familiar with Visual Explain (VE)...
https://www.itechsol.com/using-visual-explain-in-access-client-solutions-to-enhance-the-performance-of-sql-processing/

Charles

On Tue, Mar 1, 2022 at 9:43 AM Denis Robitaille <
denis_robitaille@xxxxxxxxxxxx> wrote:

Hello,

I am not familiar with visual explain. I will look into this.
We are talking going from about 2 minutes to close to 20.
The target file already exist and is cleared before I execute the SQL
script

-----Message d'origine-----
De : MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> De la part de Jim
Oberholtzer
Envoyé : 1 mars 2022 11:37
À : Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Objet : Re: Unexpected SQL performance behavior

Cascades - External Email


What does visual explain show when you do the insert?

10 times longer represents, how long? If you are creating a new object
with the insert, that might explain some of it, but if your are saying it
takes 30 milliseconds VS. 10 milliseconds, then I’m not sure why we care.
Scale is important here.

Jim Oberholtzer
Agile Technology Architects



On Mar 1, 2022, at 9:59 AM, Denis Robitaille <
denis_robitaille@xxxxxxxxxxxx> wrote:

Hello all,

I am currently working on a complex (for me) SQL script. When I run it
to display the result on the screen, it works fine. When I change it to put
the result of the SELECT in a file (by inserting the appropriate INSERT
INTO... before the SELECT), it takes more that 10 times longer to execute!!

I am working with a small subset of data and the resulting data set is
just 51 rows.

Any help on understanding this behavior and on how to avoid it is very
appreciated.

[cid:image001.png@01D82D5A.F658C930]<http://www.cascades.com/fr>
Denis Robitaille
Analyste TI
CASCADES CANADA ULC
412 Boul. Marie-Victorin
Kingsey Falls (QC) Canada J0A 1B0
Tél. : 819 363 6100 Poste : 52130
Cell. : 819 352 9362


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