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* infinite loop in an update statement
@ 2024-09-09 14:55 Fabrice Chapuis <[email protected]>
0 siblings, 2 replies; 4+ messages in thread
From: Fabrice Chapuis @ 2024-09-09 14:55 UTC (permalink / raw)
To: pgsql-general
Hi,
table a and b are empty, this query does not return. It seems we enter in
infinite loop.
why this update does not return instantly?
UPDATE table_a a
SET col1 = (SELECT MIN(b.col1)
FROM table_b b
WHERE b.col2 = a.col2)
Regards,
Fabrice
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: infinite loop in an update statement
@ 2024-09-09 15:00 Tom Lane <[email protected]>
parent: Fabrice Chapuis <[email protected]>
1 sibling, 0 replies; 4+ messages in thread
From: Tom Lane @ 2024-09-09 15:00 UTC (permalink / raw)
To: Fabrice Chapuis <[email protected]>; +Cc: pgsql-general
Fabrice Chapuis <[email protected]> writes:
> why this update does not return instantly?
> UPDATE table_a a
> SET col1 = (SELECT MIN(b.col1)
> FROM table_b b
> WHERE b.col2 = a.col2)
Maybe query is waiting for a lock on one of those tables?
regards, tom lane
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: infinite loop in an update statement
@ 2024-09-09 15:00 Adrian Klaver <[email protected]>
parent: Fabrice Chapuis <[email protected]>
1 sibling, 1 reply; 4+ messages in thread
From: Adrian Klaver @ 2024-09-09 15:00 UTC (permalink / raw)
To: Fabrice Chapuis <[email protected]>; pgsql-general
On 9/9/24 07:55, Fabrice Chapuis wrote:
> Hi,
>
> table a and b are empty, this query does not return. It seems we enter
> in infinite loop.
> why this update does not return instantly?
>
> UPDATE table_a a
> SET col1 = (SELECT MIN(b.col1)
> FROM table_b b
> WHERE b.col2 = a.col2)
Do you have an UPDATE trigger on table_a?
>
> Regards,
>
> Fabrice
>
>
--
Adrian Klaver
[email protected]
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: infinite loop in an update statement
@ 2024-09-10 14:57 Adrian Klaver <[email protected]>
parent: Adrian Klaver <[email protected]>
0 siblings, 0 replies; 4+ messages in thread
From: Adrian Klaver @ 2024-09-10 14:57 UTC (permalink / raw)
To: Fabrice Chapuis <[email protected]>; +Cc: pgsql-general
On 9/10/24 07:47, Fabrice Chapuis wrote:
Reply to list also
Ccing list
> no trigger on theses tables
>
> On Mon, Sep 9, 2024 at 5:00 PM Adrian Klaver <[email protected]
> <mailto:[email protected]>> wrote:
>
> On 9/9/24 07:55, Fabrice Chapuis wrote:
> > Hi,
> >
> > table a and b are empty, this query does not return. It seems we
> enter
> > in infinite loop.
> > why this update does not return instantly?
> >
> > UPDATE table_a a
> > SET col1 = (SELECT MIN(b.col1)
> > FROM table_b b
> > WHERE b.col2 = a.col2)
>
> Do you have an UPDATE trigger on table_a?
>
> >
> > Regards,
> >
> > Fabrice
> >
> >
>
> --
> Adrian Klaver
> [email protected] <mailto:[email protected]>
>
--
Adrian Klaver
[email protected]
^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2024-09-10 14:57 UTC | newest]
Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed)
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2024-09-09 14:55 infinite loop in an update statement Fabrice Chapuis <[email protected]>
2024-09-09 15:00 ` Tom Lane <[email protected]>
2024-09-09 15:00 ` Adrian Klaver <[email protected]>
2024-09-10 14:57 ` Adrian Klaver <[email protected]>
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