Re: Repeatable Read Isolation Level "transaction start time"

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From: Greg Sabino Mullane <[email protected]>
To: Ron Johnson <[email protected]>
Cc: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: Repeatable Read Isolation Level "transaction start time"
Date: Wed, 25 Sep 2024 16:49:34 -0400
Message-ID: <CAKAnmmL05Lt89EOnMW111qdUOau+dYG7u8ff5o+ckKKohnNwGg@mail.gmail.com> (raw)
In-Reply-To: <CANzqJaAAQFD_JvK=ChmfdGCRNP0G5gMtVBgF52bZiFjQxH8N_Q@mail.gmail.com>
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>
> Since transactions should be "as short as possible, without being too
>> short", how much time is there between when you run "BEGIN;" and the first
>> "work statement"?
>>
>
I don't know that it really matters. For something automated, it would be a
few milliseconds. Either way, I'm sure most people/apps already think of
the initial 'BEGIN ...' as the start of the transaction, and act
accordingly.

Maybe long-term something like

BEGIN   ISOLATION MODE REPEATABLE READ   SNAPSHOT NOW;

could be useful.

Cheers,
Greg

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