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From: Laurenz Albe <[email protected]>
To: Ramakrishna m <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: Performance Issue with Hash Partition Query Execution in PostgreSQL 16
Date: Wed, 06 Nov 2024 19:23:11 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAG-eXHJ+KbQ8_k-jKSGZU9V6HkLKU2Jqz7nYMYGhHuC-Zqm7qQ@mail.gmail.com>
References: <CAG-eXHJ+KbQ8_k-jKSGZU9V6HkLKU2Jqz7nYMYGhHuC-Zqm7qQ@mail.gmail.com>

On Wed, 2024-11-06 at 22:43 +0530, Ramakrishna m wrote:
> One of the queries, which retrieves a single record from a table with 16 hash partitions,
> is taking more than 10 seconds to execute. In contrast, when we run the same query manually,
> it completes within milliseconds.

If I read your file right, the slow execution has an additional "LIMIT 55".
That can make a difference.

In general, you can use auto_explain to get the execution plan of the slow query.

Yours,
Laurenz Albe

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