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From: Ron Johnson <[email protected]>
To: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: Repeatable Read Isolation Level "transaction start time"
Date: Wed, 25 Sep 2024 13:56:51 -0400
Message-ID: <CANzqJaBZi36rKDn3+R_vgfV6CPOOea8xmomav1zkF8WQwg5+sw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Wed, Sep 25, 2024 at 1:53 PM Tom Lane <[email protected]> wrote:

> Ron Johnson <[email protected]> writes:
> > But why does "SELECT 1;" need a snapshot?  Heck, why does "SELECT
> > <immutable>;" need a snapshot?
>
> Because we're not going to analyze the statement in the amount of
> depth needed to make that distinction before we crank up the
> transactional machinery.  If it says SELECT, it gets a snapshot.
>

Perfectly reasonable.

-- 
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> crustacean!

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