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From: Tom Lane <[email protected]>
To: Wizard Brony <[email protected]>
Cc: [email protected]
Subject: Re: Repeatable Read Isolation Level "transaction start time"
Date: Tue, 24 Sep 2024 10:28:46 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Wizard Brony <[email protected]> writes:
> But in my testing, I find that according to that statement, the transaction start time is actually "the start of the first non-transaction-control statement in the transaction" (as mentioned earlier in the section). Is my conclusion correct, or am I misunderstanding the documentation?

It's even looser than that, really: it's the first statement that
requires an MVCC snapshot.  From memory, LOCK TABLE is an important
exception --- you can acquire table locks before pinning down
a snapshot, and this is important in some scenarios.

			regards, tom lane

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