| From: | Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> |
|---|---|
| To: | "Ryo Yamaji (Fujitsu)" <yamaji(dot)ryo(at)fujitsu(dot)com>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Access plan selection logic PG9.2 -> PG14 |
| Date: | 2023-09-14 14:59:42 |
| Message-ID: | 9da2d3e1-708d-ba92-cdec-96f3bddec397@aklaver.com |
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| Lists: | pgsql-general |
On 9/14/23 00:15, Ryo Yamaji (Fujitsu) wrote:
>
> Hi all
>
> I am planning to migrate from PostgreSQL9.2 to PostgreSQL14.7.
> Running the same SQL with the same statistics as previous versions resulted in different access plans.
> I have no knowledge of the PostgreSQL planner and would like to be informed. Please assist.
>
> Behavior:
> I am using an environment in which the statistics have been manually updated using pg_dbms_stats. (*)
Why not just run ANALYZE on the new 14.7 instance?
> In PostgreSQL9.2, the primary key was selected when a SELECT was executed with all columns of the primary key specified as equals in the where clause.
--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com
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