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From: Laurenz Albe <[email protected]>
To: Edson Richter <[email protected]>
To: [email protected] <[email protected]>
Subject: Re: Read-only connectios optimizatios
Date: Sat, 25 Jan 2025 19:01:31 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CPVP215MB18233EA81EAAD56516064077CFE22@CPVP215MB1823.LAMP215.PROD.OUTLOOK.COM>
References: <CPVP215MB18233EA81EAAD56516064077CFE22@CPVP215MB1823.LAMP215.PROD.OUTLOOK.COM>

On Sat, 2025-01-25 at 14:55 +0000, Edson Richter wrote:
> -Connections are established using the jdbc "readonly" attribute.
> 
> Does PostgreSQL perform any optimization on queries in this scenario to avoid
> establishing locks? Or are these queries treated like any other?

The only difference that I am aware of is that read-only transactions at the
SERIALIZABLE isolation level can release predicate locks earlier, which can
benefit performance.

But I don't think that you need to worry: reading transactions only take an
ACCESS SHARE lock on tables, which won't conflict with data modifications.

Yours,
Laurenz Albe

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