Stephen Frost <sfrost@snowman.net> writes:
> * Tom Lane (tgl@sss.pgh.pa.us) wrote:
>> This seems to provide a reasonably principled
>> argument why we might want to fix this case with a localized use of an
>> MVCC scan before we have such a fix globally.
> I had discussed that idea a bit with Andres on IRC and my only concern
> was if there's some reason that acquiring a snapshot during createdb()
> would be problematic. It doesn't appear to currently and I wasn't sure
> if there'd be any issues.
Don't see what. The main reason we've not yet attempted a global fix is
that the most straightforward way (take a new snapshot each time we
start a new SnapshotNow scan) seems too expensive. But CREATE DATABASE
is so expensive that the cost of an extra snapshot there ain't gonna
matter.
regards, tom lane