Re: MVCC snapshot timing

Bruce Momjian <bruce@momjian.us> writes:
> On Mon, Nov 11, 2013 at 03:39:45PM -0500, Tom Lane wrote:
>> I'm not really seeing the point of s/transaction/session/ here.

> Well, the problem with the original wording is that we don't take a new
> snapshot for every transaction in the default read-committed mode.

We take at least one snapshot per transaction, in any mode.  Referring
to sessions makes it even further away from being a useful concept.

> Would you prefer I refer to statements, e.g.:

'Statement' might work.

            regards, tom lane