RE: Unexpected SQL performance behavior

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

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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>
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CASCADES CANADA ULC
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