Simon Riggs <si...@2ndquadrant.com> writes: > On Wed, 2011-01-19 at 19:05 -0600, Kevin Grittner wrote: >> The idea is that whenever we see a valid snapshot which would yield >> a truly serializable view of the data for a READ ONLY transaction, >> we add a WAL record with that snapshot information.
> You haven't explained why this approach is the way forwards. What other > options have been ruled out, and why. The above approach doesn't sound > particularly viable to me. I'm pretty concerned about the performance implications, too. In particular that sounds like you could get an unbounded amount of WAL emitted from a *purely read only* transaction flow. Which is not going to fly. regards, tom lane -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers