| From: | "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com> |
|---|---|
| To: | 'Andrew Dunstan' <andrew(at)dunslane(dot)net>, Jeff Davis <pgsql(at)j-davis(dot)com>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, jian he <jian(dot)universality(at)gmail(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, Stephen Frost <sfrost(at)snowman(dot)net>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "alvherre(at)alvh(dot)no-ip(dot)org" <alvherre(at)alvh(dot)no-ip(dot)org> |
| Subject: | RE: Statistics Import and Export |
| Date: | 2025-02-21 07:24:13 |
| Message-ID: | OSCPR01MB149665630030E7F54FDA8B27BF5C72@OSCPR01MB14966.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
Dear members,
I hope I'm in the correct thread. I found the commit 1fd1bd8 - it is so cool.
I have a question for it.
ISTM commit message said that no need to do ANALYZE again.
```
Add support to pg_dump for dumping stats, and use that during
pg_upgrade so that statistics are transferred during upgrade. In most
cases this removes the need for a costly re-analyze after upgrade.
```
But pgupgrade.sgml [2] and source code [3] said that statistics must be updated.
Did I miss something, or you have been updating this?
[2]:
```
Because optimizer statistics are not transferred by <command>pg_upgrade</command>, you will
be instructed to run a command to regenerate that information at the end
of the upgrade. You might need to set connection parameters to
match your new cluster.
```
[3]:
```
pg_log(PG_REPORT,
"Optimizer statistics are not transferred by pg_upgrade.\n"
"Once you start the new server, consider running:\n"
" %s/vacuumdb %s--all --analyze-in-stages", new_cluster.bindir, user_specification.data);
```
Best regards,
Hayato Kuroda
FUJITSU LIMITED
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