On Tue, Nov 12, 2013 at 08:39:35PM -0500, Bruce Momjian wrote:
> > My specific wording is incoherent mostly because it really belongs to a
> > larger corpus that currently exists only in my head.
>
> Oh, OK, it sounds fine. The user really doesn't choose what timeline to
> see --- rather, it is the current xid at the time they take their
> snapshot and other running xids that controls that. You can control
> your transaction isolation level, but that only controls how often you
> take snapshots.
[ moved to hackers ]
Actually, it would be possible to allow snapshots that are equal to the
earliest active snapshot for the current database. I don't think it
would be useful in production, but perhaps for debugging or some
disaster recovery.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ Everyone has their own god. +