Re: Query is taking too long i intermittent

Thanks for the tip! I will update my process and monitor it.

On Mon, Jun 6, 2022 at 7:41 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> > On Mon, Jun 06, 2022 at 03:28:43PM +0530, Mayank Kandari wrote:
> >> SELECT event_id FROM event WHERE (event_sec > time.seconds) OR
> >> ((event_sec=time.seconds) AND (event_usec>=time.useconds) ORDER BY
> >> event_sec, event_usec LIMIT 1
>
> > I think it'd be better if the column was a float storing the fractional
> number
> > of seconds. Currently, it may be hard for the planner to estimate
> rowcounts if
> > the conditions are not independent. I don't know if it's related to this
> > problem, though.
>
> Also, even if you can't change the data representation, there's a more
> idiomatic way to do that in SQL: use a row comparison.
>
> SELECT ...
> WHERE row(event_sec, event_usec) >= row(time.seconds, time.useconds) ...
>
> I doubt this is notably more execution-efficient, but if you're getting a
> bad rowcount estimate it should help with that. It's easier to read too.
>
> regards, tom lane
>

--
regards
Mayank Kandari