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From: Laurenz Albe <[email protected]>
To: Simon Windsor <[email protected]>
To: [email protected]
Subject: Re: Slow timestamp query after upgrading from Pg13 to Pg16
Date: Mon, 07 Apr 2025 16:51:40 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Mon, 2025-04-07 at 15:48 +0100, Simon Windsor wrote:
> After upgrading a Db from Pg13 (Centos) to Pg16(Ubuntu) some queries
> on a simple, large table (200M rows) are very slow

If you used "pg_upgrade", did you ANALYZE the database?

If that is not the problem, we can't guess what your problem might be
unless you provide EXPLAIN (ANALYZE, BUFFERS, SETTINGS) output for auch a
slow query.  Ideally, add the same information for the fast v13 case.

Yours,
Laurenz Albe

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