On Mon, Aug 3, 2015 at 4:13 AM, Simon Riggs <si...@2ndquadrant.com> wrote: > * For normal VACUUMs we should scan indexes only if (num_dead_tuples * 20) > > (blocks to be scanned in any one index), which allows some index bloat but > not much
I think this kind of heuristic is good, but I think we should expose a setting for it. There's no way for us to know without testing whether the right value for that multiplier is 2 or 20 or 200 or 2000, and if we don't make it easy to tweak, we'll never find out. It may even be workload-dependent. -- 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
