Re: Streaming replica hangs periodically for ~ 1 second - how to diagnose/debug

On 8/22/25 05:37, hubert depesz lubaczewski wrote:
> On Thu, Aug 21, 2025 at 11:17:27AM -0700, Adrian Klaver wrote:
>> Have you looked at?:
>> https://www.pgbouncer.org/changelog.html#pgbouncer-124x
>> To see if anything stands out.
>> Then there is:
>> https://www.pgbouncer.org/config.html#max_prepared_statements
>> The below may also be worth looking at:
>> https://github.com/pgbouncer/pgbouncer/pull/1144
>> I can't help thinking that there is a caching issue at stake, though that is
>> just a guess.
>
> Will check, but we don't use prepared statements, so this doesn't seem
> to be part-of-the-problem.

In your OP there is:

"Every now and then (usually every 3-5 minutes, but not through the whole
day), we see situations where every query suddently takes ~ 1 second.

I'm talkign about "prepare" for preparing statements. binds. also
"discard all".
"

Is that referring to something else?

>
> Best regards,
>
> depesz
>

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