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From: hubert depesz lubaczewski <[email protected]>
To: Eşref Halıcıoğlu <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: About PostgreSQL Query Plan
Date: Mon, 13 Jan 2025 16:42:56 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Mon, Jan 13, 2025 at 05:26:09PM +0300, Eşref Halıcıoğlu wrote:
> Hello,
>  
> I have a query in PostgreSQL and I want this query to retrieve only data from the last 3 months. However, when I examine the query
> plan, I see that all partitions are listed.

Please note that your explain is for update, not select (which
"retrieve" in your mail would suggest).

> This raises a few questions in my mind:
> 
>   • Are all partitions really being accessed, or only the partitions of the last 3 months are being accessed while the other
>     partitions have to be shown in the query plan?

Not really possible to tell without reading explain *analyze*.
Potentially all. But perhaps just fewer.

Best regards,

depesz

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