Gavin Flower <gavinflo...@archidevsys.co.nz> wrote: > For example, assume 1000 rows of 200 bytes and 1000 rows of 20 bytes, > using 400 byte pages. In the pathologically worst case, assuming > maximum packing density and no page has both types: the large rows would > occupy 500 pages and the smaller rows 50 pages. So if one selected 11 > pages at random, you get about 10 pages of large rows and about one for > small rows!
With 10 * 2 = 20 large rows, and 1 * 20 = 20 small rows. -- Kevin Grittner EDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers