Re: PostgresSQL 9.5.21 very slow to connect and perform basic queries
| От | bruno da silva |
|---|---|
| Тема | Re: PostgresSQL 9.5.21 very slow to connect and perform basic queries |
| Дата | |
| Msg-id | CAB+Nuk_qs4Y859Q=AsJyjVcQam9E98+bsL9p_-JTJgoWAM-Juw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: PostgresSQL 9.5.21 very slow to connect and perform basic queries (Justin Pryzby <pryzby@telsasoft.com>) |
| Ответы |
Re: PostgresSQL 9.5.21 very slow to connect and perform basic queries
|
| Список | pgsql-performance |
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
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