=?ISO-8859-1?Q?C=E9dric_Villemain?= <cedric.villemain.deb...@gmail.com> writes: > 2011/5/29 Tom Lane <t...@sss.pgh.pa.us>: >> OK, do you like the attached version of that logic? (Other fragments >> of the patch as before.)
> The idea was that remove only one page from the VACUUM will prevent > relfrozenxid update and reltuples (and relpages) update. > Now, I beleive that once we've skip at least one page thanks to > SKIP_PAGES_THRESHOLD, then we should be more agressive and remove as > many as possible pages from the VACUUM, tks to the VM. That would require proof, not just suggestion. Skipping pages will defeat the OS read-ahead algorithm, and so could easily cost more than reading them. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers