| From: | Robert Treat <rob(at)xzilla(dot)net> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Rambabu V <ram(dot)wissen(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: regarding statistics retaining with 18 Upgrade |
| Date: | 2025-11-15 23:52:15 |
| Message-ID: | CABV9wwO8nZ8UXQP0+sDSvM9D8uOsmCpyXgtqS=fCFz1YeXB8KA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sat, Nov 15, 2025 at 9:32 AM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> On Sat, Nov 15, 2025 at 06:02:53PM +0800, Rambabu V wrote:
> > Hi Team,
> >
> > seems stats are not retained after upgrade. Below are the artifacts , is it
> > expected? as per the release notes statistics should be retained.
>
> Uh, it is the _optimizer_ statistics that are preserved by pg_upgrade,
> not the cumulative statistics system:
>
> https://www.postgresql.org/docs/current/monitoring-stats.html
>
> Yes, they are easily confused.
>
I wonder if it might be worth trying to clarify this a little bit
more... perhaps something like the attached?
Robert Treat
https://xzilla.net
| Attachment | Content-Type | Size |
|---|---|---|
| v1-0001-Clarify-statistics-dumped-by-statistics.patch | application/octet-stream | 4.1 KB |
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