On Mon, Jan 30, 2023 at 05:47:49PM +0000, Mok wrote:
> Hi,
>
> We've started to observe instances of one of our databases stalling for a
> few seconds.
>
> We see a spike in wal write locks then nothing for a few seconds. After
> which we have spike latency as processes waiting to get to the db can do
> so.
>
> There is nothing in the postgres logs that give us any clues to what could
> be happening, no locks, unusually high/long running transactions, just a
> pause and resume.
>
> Could anyone give me any advice as to what to look for when it comes to
> checking the underlying disk that the db is on?
What version postgres? What settings have non-default values ?
What OS/version? What environment/hardware? VM/image/provider/...
Have you enabled logging for vacuum/checkpoints/locks ?
https://wiki.postgresql.org/wiki/Slow_Query_Questions