On 11 December 2013 00:28, Greg Stark <st...@mit.edu> wrote: > On Wed, Dec 11, 2013 at 12:14 AM, Simon Riggs <si...@2ndquadrant.com> > wrote: >> Block sampling, with parameter to specify sample size. +1 > > Simon this is very frustrating. Can you define "block sampling"?
Blocks selected using Vitter's algorithm, using a parameterised fraction of the total. When we select a block we should read all rows on that block, to help identify the extent of clustering within the data. -- Simon Riggs 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
