Re: Connections Increasing Slowly

On Jun 22, 2020, at 10:07 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> Hmm. If the client thinks the server dropped the connection, but the
> server thinks the connection is still live, that smells strongly of
> network-level disconnects. Does the client let the connection sit idle
> for more than a minute or two at a time? If so I'd bet that some firewall
> in between is deciding that the connection is dead and dropping it.
> Again, setting the server's tcp_keepalives_* settings could help fix that,
> by ensuring that the network connection sees some traffic regularly.
>
> regards, tom lane

Hi Tom. Some more testing.

Turned off firewalld, same issue. Some notes:

I have one simple query that’s in my activity (currently active) that’s in there 5 times. It should have closed very quickly, yet there’s 5 instances idling. I have two other queries, that should have operated quickly, then closed, but they are idling.

tcp_keepalives* are around 3.

Any idea where to look now?

I’ve set my max_connections to 12 (4 cores * 3).

Cheers, Bee