Re: PostgresSQL 9.5.21 very slow to connect and perform basic queries

Thanks, I will check it out.

On Thu, Jul 21, 2022 at 4:21 PM Justin Pryzby <pryzby@telsasoft.com> wrote:

> On Thu, Jul 21, 2022 at 03:59:30PM -0400, bruno da silva wrote:
> >   OS/version: CentOS release 6.9 (Final)
>
> How are these set ?
>
> tail /sys/kernel/mm/ksm/run
> /sys/kernel/mm/transparent_hugepage/{defrag,enabled,khugepaged/defrag}
> /proc/sys/vm/zone_reclaim_mode
>
> I suspect you may be suffering from issues with transparent huge pages.
>
> I suggest to disable KSM and THP, or upgrade to a newer OS.
>
> I've written before about these:
> https://www.postgresql.org/message-id/20170524155855.GH31097@telsasoft.com
> https://www.postgresql.org/message-id/20190625162338.GF18602@telsasoft.com
> https://www.postgresql.org/message-id/20170718180152.GE17566@telsasoft.com
> https://www.postgresql.org/message-id/20191004060300.GA11241@telsasoft.com
> https://www.postgresql.org/message-id/20200413144254.GS2228@telsasoft.com
> https://www.postgresql.org/message-id/20220329182453.GA28503@telsasoft.com
>
> On Thu, Jul 21, 2022 at 04:01:10PM -0400, bruno da silva wrote:
> > The issue started a month ago.
>
> Ok .. but how long has the DB been running under this environment ?
>
> --
> Justin
>


-- 
Bruno da Silva