On Thu, Dec 1, 2016 at 9:45 AM, xu jian <jame...@outlook.com> wrote: > Thanks for your reply. Is there any reason to update index > statistics even if there is no changes on the table? > or is there any way to disable index statistics update during vacuum freeze? > thanks
I think that the indexes only need to be scanned if the VACUUM finds dead tuples. But even 1 dead tuple will cause a complete scan of every index. I've complained about this before and I think there's room for improvement here, but nobody's been motivated enough to pursue this yet. -- 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
