On 06/18/2014 09:12 PM, Robert Haas wrote: > No. Otherwise, one of those bits could get changed after a backend > takes a snapshot and before it finishes using it - so that the > transaction snapshot is in effect changing underneath it. You could > avoid that by memorizing the contents of CLOG when taking a snapshot, > but that would defeat the whole purpose of CSN-based snapshots, which > is to make the small and fixed-size.
Ah. Thankyou. I appreciate the explanation. -- Craig Ringer http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
