Alvaro Herrera <alvherre@commandprompt.com> writes:
> Excerpts from Tom Lane's message of mié sep 08 12:12:31 -0400 2010:
>> AFAIR it doesn't keep the first snapshot around. If it did, most of
>> your work on snapshot list trimming would have been useless, no?
> That's my point precisely. The name "IsolationUsesXactSnapshot" makes
> it sound like it applies to any transaction that uses snapshots for
> isolation, doesn't it?
I don't think so, at least not when compared to the alternative
IsolationUsesStmtSnapshot.
> How about IsolationUses1stXactSnapshot
This just seems longer, not really better. In particular, we have
*always* adhered to the phraseology that a "transaction snapshot"
is the first one taken in a transaction, so I don't see exactly
why it's confusing you now.
regards, tom lane