On Tue, Sep 6, 2016 at 2:16 PM, Simon Riggs <si...@2ndquadrant.com> wrote: > What occurs to me is that we can exactly predict how many tuples we > are going to get when we autovacuum, since we measure that and we know > what the number is when we trigger it. > > So there doesn't need to be any guessing going on at all, nor do we > need it to be flexible.
No, that's not really true. A lot can change between the time it's triggered and the time it happens, or even while it's happening. Somebody can run a gigantic bulk delete just after we start the VACUUM. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
