Re: Query performance issue

On 10/16/24 10:50 AM, yudhi s wrote:
> Hi,
>
> Below question got in one discussion.Appreciate any guidance on this.
>
> Below is a query which is running for ~40 seconds. As it's a query which
> is executed from UI , we were expecting it to finish in <~5 seconds. It
> has a "IN" and a "NOT IN" subquery , from the execution path it seems
> the total response time is mainly, to be sum of the "IN" and the "NOT
> IN" subquery section. My thought was that both "IN" and "NOT IN" should
> be executed/evaluated in parallel but not in serial fashion.
>
> In the execution path below , the line number marked in *bold* are the
> top lines for the IN and NOT IN subquery evaluation and they are showing
> "Actual time" as  Approx ~9 seconds and ~8 seconds and they seems to be
> summed up and the top lines showing it to be ~19 seconds. Then onwards
> it keeps on increasing with other "nested loop" joins.
>
> *Note*:- This query is running on a MYSQL 8.0 database. So I'm wondering
> if there is any mysql list similar to Oracle list , in which i can share
> this issue?
>

This is the Postgres list.

As to your question maybe one of the forums?:

https://forums.mysql.com/

In particular Performance:

https://forums.mysql.com/list.php?24

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com