On 18 April 2016 at 12:11, David Rowley <david.row...@2ndquadrant.com>
> this is not helping me much as I don't really understand why
> pg_statistic need to be frozen?
Yeah, in particular it's not clear to me why pg_upgrade goes to such
efforts to freeze everything when it copies pg_clog over in
Is it mainly a defense against the multixact format change?
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services