On Fri, 2008-12-12 at 18:01 +0000, Greg Stark wrote: > I think you need to find two different formulas, one which represents > a clustered table and one which represents randomly distributed data. > Then you need a way to measure just how clustered the data is so you > know how much weight to give each formula. Perhaps comparing the > number of duplicates in whole-block samples versus overall random > selections would give that measure.
Please read the Chaudhuri paper. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
