Kevin Grittner wrote: > Wouldn't we get substantially the same thing just by counting tuple > inserts toward the autovacuum vacuum threshold? I mean, it unless > the table is due for wraparound prevention autovacuum, it will only > visit pages that don't have the all-visible bit set, right? And > how much work would that do beyond what you're describing if none > of the tuples are dead?
The problem is precisely what happens if there are some dead tuples, but not enough to reach the 20% threshold: this vacuum now has to scan the table twice and has to clean up indexes also. -- Álvaro Herrera 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
